Ppt on moving coil galvanometer

Instrumentation and Measurement

torque and electrical connections through spiral spring.  If a pointer is attached to the moving coil so that it passes over a suitably calibrated scale, the galvanometer can be used to measure quantitatively the current passing through it. Such calibrated galvanometers are used in many electrical measuring devices. PMMC Permanent magnet moving coil and errors due to PMMC…???? Its part of your assignment 1… brief and/


1 Unit Ten : Magnetism And Electromagnetism John Elberfeld ET115 DC Electronics.

more electricity, increase the magnetic field, the number of coils, and the rate the coils moveTo generate more electricity, increase the magnetic field, the number of coils, and the rate the coils move 47 Faraday’s Laws of Electromagnetic Induction Faraday gave two / wire in parallel with the galvanometer.A galvanometer can be converted into an ammeter by using a low-resistance wire in parallel with the galvanometer. 55Voltmeter An analog voltmeter is a high-resistance galvanometer. It is used to measure/


Magnetic Fields - Review Magnetic fields are produced by magnetised magnetic materials such as iron electric currents I.

operated as a microphone (in principle the same as an AC generator) Connect the inputs of two moving coil galvanometers to each other and pick up one of the meters and gently rock it so that the needle moves back and forth. The needle on the other meter moves correspondingly, because the meter being rocked is acting as an AC generator, and the other meter/


Instrumentation and Measurements Dr. Mohammad Kilani

the iron core we have The rotation of the current carrying coil in the magnetic field generates an opposing electromotive force Em, given by: Applying Kirchhoff’s law to the resulting circuit gives, Dynamic Response of a Galvanometer The equations are coupled. The current due to potential E produces torque T that moves the pointer. This motion develops an opposing potential Em. Dynamic/


Quote of the day. Week 2: Voltage & Current Measurement.

in parallel can damage the meter Ammeter – Principle of Operation  The earliest design is the DArsonval galvanometer or moving coil ammeter (respond to ac only)galvanometer  It uses magnetic deflection, where current passing through a coil causes the coil to move in a magnetic fieldmagneticmagnetic field  The voltage drop across the coil is kept to a minimum to minimize resistance across the ammeter in any circuit into which/


Applied Electricity.

magnetic induction. Loudspeaker – Moving Coil A moving coil is moved by a changing input current. The paper cone compresses and rarefies the air. Input Microphone A moving coil activated by voice vibrations is used as a microphone. The coil induces a current in /the force or torque from the current in the magnetic field Scale Current loop or coil Radial Magnetic Field Spring Galvanometer used as Ammeter Typical galvanometer have an internal resistance of the order of 60 Ω - that could significantly disturb/


Yes, midway between the wires. Yes, 12 cm from the 5A wire.

39 40 41 42 43 44 45 46 47 48 49 50 time to go around the circle once When a magnetic field causes a charged particle to move in a circular path, the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particles energy / to be converted into an ammeter which reads 5 A at a full scale deflection. What resistance should be placed in parallel with the galvanometer coil? 2.5 ohms 0.5 ohms 0.25 ohms 0.05 ohms 1 2 3 4 5 6 7 8 9 10 11 12 13 14/


MISCLLANEOUS MEASURING INSTRUMENTS

from the battery. A variable resistance and ammeter connected in the circuit, limit the flow of current. A galvanometer is also connected between the points PQ and pq or between the terminal FK. KELVIN DOUBLE BRIDGE METHOD The/ the supply frequency falls, the capacitive reactance becomes more than inductive reactance of the circuit, then the moving coil moves towards the magnetising coil till its inductive reactance becomes equal to capacitive reactance of its circuit. POWER FACTOR METER The instrument used/


Magnetism and Its Uses Section 3 Producing Electric CurrentProducing Electric Current Section 1 Magnetism Section 2 Electricity and MagnetismElectricity.

around an iron core, an electromagnet is formed. An electromagnet is a temporary magnet made by wrapping a wire coil carrying a current around an iron core. Section 2 Section 2 Electricity and Magnetism Electromagnets The solenoid’s magnetic/ engine make a needle move in a gauge on the dashboard? These gauges are galvanometers, which are devices that use an electromagnet to measure electric current. Section 2 Section 2 Electricity and Magnetism Galvanometers In a galvanometer, the electromagnet is connected/


37 Electromagnetic Induction Magnetism can produce electric current, and electric current can produce magnetism.

field affect a moving charge? 37.4 Motor and Generator Comparison 37 Electromagnetic Induction A transformer works by inducing a changing magnetic field in one coil, which induces an alternating current in a nearby second coil. 37.5 Transformers 37 Electromagnetic Induction Consider a pair of coils, side by side, one connected to a battery and the other connected to a galvanometer. It is customary/


Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Magnets and the magnetic field Electric currents create magnetic fields.

an induced current in a coil of wire? C. A magnet being moved into or out of the coil. Slide 25-3 Answer Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Hold the coil so it is vertical Bring the north pole of the magnet toward the coil Record the galvanometer reading Pull the magnet away from the coil Record the galvanometer reading Repeat with the/


Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Magnets and the magnetic field Electric currents create magnetic fields.

the magnet is moved into the coil 2.Test your prediction about the direction of the induced current using Lenzs Law. (Be sure to determine which direction the coil is wound as well as which direction of current a positive reading on the galvanometer indicates) 3.Place a second coil of wire next to the coil that is connected to the galvanometer. Connect the second coil to a/


EKT112:Principles of Measurement and Instrumentation

in parallel can damage the meter Ammeter – Principle of Operation The earliest design is the DArsonval galvanometer or moving coil ammeter (respond to ac only) It uses magnetic deflection, where current passing through a coil causes the coil to move in a magnetic field The voltage drop across the coil is kept to a minimum to minimize resistance across the ammeter in any circuit into which the/


2/8/2010 Do Now: 12/16/2013 (on last week’s paper) What makes a magnet a magnet? What makes a magnet a magnet? Why are some magnets stronger than others?

amount of deflection of a needle attached to the coil may be proportional to the current passing through the coil. Such "meter movements" were at the heart of the moving coil meters such as voltmeters and ammetersuntil they were largely replaced with solid state meterselectric currenttorquemoving coil metersvoltmetersammeterselectric currenttorquemoving coil metersvoltmetersammeters 2/8/2010 galvanometer galvanometer galvanometer 2/8/2010 Galvanometer A galvanometer is the basis of an ammeter and a/


8.

the field around a straight wire. Electricity and Magnetism 8.2 Electromagnets A single wire wrapped into a cylindrical wire coil is called a solenoid. The magnetic field inside a solenoid is stronger than the field in a single loop. /in the engine make a needle move in a gauge on the dashboard? These gauges are galvanometers, which are devices that use an electromagnet to measure electric current. Electricity and Magnetism 8.2 Using Galvanometers In a galvanometer, the electromagnet is connected to a/


12 TH STANDARD PHYSICS EFFECTS OF ELECTRIC CURRENT Prepared by: R.RAJENDRAN, M.A., M.Sc., M.Ed., N. INGARAN, M.Sc., M.Phil.,M.Ed.,

-24 c) 4.8 × 10 10 d) 1.602 × 10 -19 CHOOSE THE CORRECT ANSWER 18. The magnetic field in a moving coil galvanometer is the …… magnetic field. a) perpendicular b) radial c) crossed d) non-uniform CHOOSE THE CORRECT ANSWER 19. The equation for force/. Of the following devices, which has small resistance? (a) moving coil galvanometer (b) ammeter of range 0 – 1A (c) ammeter of range 0–10 A (d) voltmeter CHOOSE THE CORRECT ANSWER 62. A galvanometer of resistance G Ω is shunted with S Ω.The effective resistance /


VCE PHYSICS Unit 3 Topic 2 ELECTRIC POWER. Unit Outline This unit covers the following areas: 1.Apply a field model to magnetic phenomena including shapes.

the following situations state whether the current through the galvanometer will zero, to the left or to the right. a. The coil is stationary and the magnet is stationary. b. The coil is stationary and the magnet is moved to the right. c. The coil is moved to the right and the magnet is stationary. d. The coil is moved to the left and the magnet is stationary/


EM InductionInduction 1 Basic definitions Electromagnetic induction : generation of electricity from magnetism Michael Faraday Next Slide Michael Faraday’s.

few seconds. Then it is removed from the coil. Flow of current in the coil would be indicated by the galvanometer. N S magnet coil galvanometer EM Induction Next Slide Induction 1 When the magnet is pushed into a coil, current flows in the coil. This current is called induced current. N S direction of moving I : induced current NS Coil becomes a magnet EM Induction Next Slide Induction/


Electromagnetic Induction Colby, Heston, Nathan, Elizabeth, Joseph.

and light up cities by night. Faraday and Henry discovered that electric current could be produced in a wire by simply moving a magnet in or out of a wire coil (Conceptual Physics, 554). Hewitt, P. G. (1998). Conceptual physics (Vol. P. 554). Reading, MA: /drive, then the meter stick and finally the pair of scissors and record all of your data. Apparatus and Materials 1) Coil of wire 2) Connecting wire 3) Galvanometer 4) Magnet 5) Pencil 6) Paper 7) Pen 8) Flash Drive 9) Meter Stick 10) Scissors Step-by-/


Faraday’s Law of Induction

will deflect in the opposite direction. If the magnet is held stationary relative to the loop, no galvanometer needle deflection is observed. If the magnet is held stationary and the coil is moved toward or away from the magnet, the galvanometer needle will also deflect. From these observations, you can conclude that a current is set up in the circuit as long as there/


In 1831, two physicists, Michael Faraday in England and Joseph Henry in the United States, independently discovered that magnetism could produce an electric.

Comparison How does a magnetic field affect a moving charge? 37.5 Transformers A transformer works by inducing a changing magnetic field in one coil, which induces an alternating current in a nearby second coil. 37.5 Transformers Consider a pair of coils, side by side, one connected to a battery and the other connected to a galvanometer. It is customary to refer to the/


NAT Review S.Y.2014-2015.

deflection is observed. The phenomenon of inducing voltage by changing magnetic field in a coil of wire is called electromagnetic induction. If the magnet is held stationary and the coil is moved toward or away from the magnet, the galvanometer needle will also deflect. From these observations, you can conclude that a current is set up in the circuit as long as there is/


1 General Physics II 2 General Physics II: Electricity & Magnetism I.Course Description Coulombs law, the electrostatic field, Gauss ’ s Law, the electrostatic.

mA. Must also have a large resistance to avoid disturbing circuit when measured in parallel. Galvanometer 60  RsRs 315 Motion of Charged Particle in magnetic field Consider positively charge particle moving in a uniform magnetic field. Suppose the initial velocity of the particle is perpendicular to/the flux is The magnitude of the average induced emf is: 369 Example: One way to Induce an emf in a coil A coil consists of 200 turns of wire having a total resistance of 2.0 . Each turn is a square of side 18 /


Chapter 31 Faraday’s Law. Michael Faraday Great experimental physicist Great experimental physicist 1791 – 1867 1791 – 1867 Contributions to early electricity.

coil There is no battery present in the secondary coil The secondary coil is not directly connected to the primary coil The secondary coil is not directly connected to the primary coil Active Figure 31.2 (SLIDESHOW MODE ONLY) Faraday’s Experiment – Findings At the instant the switch is closed, the galvanometer/ the conducting bar The applied force does work on the conducting bar This moves the charges through a magnetic field This moves the charges through a magnetic field The change in energy of the system /


EMMagnetism 1 Magnetism Lodestone : naturally occurring mineral ore For certain kind of substance, they attract irons and other special kinds of metal.

, it experiences a force. Fleming’s left hand rule Next Slide Loudspeaker Turning effect on a coil in magnetic field Simple d.c. motor Diagram EMLeft hand rule 2 Applications Practical motors Moving-coil galvanometer Next Slide Change a galvanometer into an ammeter by a shunt resistor Change a galvanometer into a voltmeter by a multiplier resistor Multimeter Photo Diagram Photo END of EM EMMagnetism 1/


Magnetism Electricity and magnetism were regarded as unrelated phenomena until it was noticed that an electric current caused the deflection of the compass.

field intensity increases as the number of loops is increased..5 Electric Currents and Magnetic Fields Magnetism A current-carrying coil of wire is an electromagnet..5 Electric Currents and Magnetic Fields Magnetism Iron filings sprinkled on paper reveal the magnetic /flows in opposite directions in the upper and lower sides of the loop. The loop is forced to move as if it were a galvanometer..8 Meters to Motors Magnetism The current is reversed during each half revolution by means of stationary contacts on/


D.C. ELECTRIC MOTORS 1. Motors use the effect of forces on current-carrying conductors in magnetic fields.

0.6 T, what would be the magnitude of the maximum torque generated and the direction the coil turned? (d)How could this device be modified in order to create a galvanometer? 1(a)1 mark Due to flow of electrons in the magnetic field, side AB will / the opposing torque of the spring. The more the coil is turned, the greater the torque of the spring. The coil would come to rest when these torques were in equilibrium. The degree to which the coil had moved would be proportional to the magnitude of the current. /


02- AC Theory.

of the magnetic field. . Module 3: Alternating Current Electromagnetism Strength of an Electromagnetic Field   The strength, or intensity, of a coils magnetic field depends on a number of factors. The major factors are listed below. 1. The number of turns of the conductor /. If the conductor is held stationary in the middle of the field of force at position 2, the galvanometer reads zero. If the conductor is moved up or down parallel to the lines of force so that none is cut, no voltage will be induced/


37 Electromagnetic Induction In 1831, two physicists, Michael Faraday in England and Joseph Henry in the United States, independently discovered that magnetism.

yellow bar magnet), which repels the bar magnet. 37.1 Electromagnetic Induction 37 Electromagnetic Induction Work must be done to move the magnet. a.Current induced in the loop produces a magnetic field (the imaginary yellow bar magnet), which repels the/ and Generator Comparison 37 Electromagnetic Induction Consider a pair of coils, side by side, one connected to a battery and the other connected to a galvanometer. It is customary to refer to the coil connected to the power source as the primary (input), /


Magnetism & Induction (and Electricity = Electromagnetism) The First Unified Theory.

Work We observe …. Because … So that … We Observe (as Faraday did)… Position of magnetDeflection in galvanometer Magnet at restNo deflection in galvanometer Magnet moves towards the coil Deflection in galvanometer in one direction Magnet is held stationary at same position (near the coil) No deflection in galvanometer Magnet moves away from the coil Deflection in galvanometer but in opposite direction Magnet is held stationary at same position (away from the/


Magnetic Field A magnetic field is a region in which a body with magnetic properties experiences a force.

Torque on a Rectangular Current- carrying Coil in a Uniform Magnetic Field Let the normal to the coil plane make an angle  with the magnetic field. The torque  is given by Moving Coil Galvanometer A moving coil galvanometer consists of a coil of copper wire which is able to/. The soft iron cylinder gives us this field shape. The Principle of a Moving Coil Galvanometer The torque due to the current in the coil is given by The coil rotates until The resisting couple due to the hair springs is Then we have /


Measuring Devices.

electroscope. It consists of two foil leaves, attached to a conducting rod, and placed in a sealed container so that air currents cannot move the foil leaves (Fig. 3-3). When a charged object is brought near, or touched to, the contact at the top of/ as direct (or dc) charges. This gives electrostatic meters an advantage over electromagnetic meters such as the galvanometers. If you connect a source of ac to the coil of the galvanometer device in Fig. 3-1 or Fig. 3-2, the compass needle will not give a clear /


1 EMT 113: V-2008 School of Computer and Communication Engineering, UniMAP Prepared By: Prepared By: Amir Razif b. Jamil Abdullah DC Meter. CHAPTER 4.

first meter movements built were known as galvanometers, and were usually designed with maximum sensitivity in mind. Figure 4.2: Voltmeter Figure 4.1: Galvanometer.Cont’d… 5 Galvanometer  A very simple galvanometer may be made from a magnetized needle/ mechanism, while current the other direction will produce a counter-clockwise torque. (a) Permanent Magnet Moving Coil (PMMC). Figure 4.4: Permanent Magnet Moving Coil (PMMC) Meter Movement.Cont’d… 11 (b) Electrostatic Meter Movement.  In the electrostatics/


37 Electromagnetic Induction Magnetism can produce electric current, and electric current can produce magnetism.

cities by night. 37 Electromagnetic Induction Electric current can be produced in a wire by simply moving a magnet into or out of a wire coil. 37.1 Electromagnetic Induction 37 Electromagnetic Induction No battery or other voltage source was needed to/ field is concentrated in the core, which extends into the secondary, so the secondary intercepts more field change. The galvanometer will show greater surges of current when the switch of the primary is opened or closed. 37.5 Transformers 37 Electromagnetic/


Definition An ammeter is an instrument that measures electric current, usually in units of amperes (or milliamps or micro amps when very small currents.

DArsonval in 1882. It was called galvanometer and was a mechanical device It was called galvanometer and was a mechanical device Diagram Basic types of Ammeter There are two basic types of ammeters. There are two basic types of ammeters. 1. The moving coil ammeter 1. The moving coil ammeter 2. The moving iron or moving magnet ammeter 2. The moving iron or moving magnet ammeter Principles of Ammeter Both/


In 1820 Hans Oersted discovered how magnetism and electricity are connected. A unit of measure of magnetic field strength, the oersted, is named after.

in the solenoid’s coils produces a magnetic field that attempts to align with the field of the permanent magnets. The greater the current, the more the solenoid rotates. Electromagnetic Devices A galvanometer uses an electromagnet to move a pointer. One / Devices The changing current produces a changing magnetic field in the solenoid coil. The magnetic force exerted by the permanent magnet moves the coil back and forth. As the coil moves, it causes a thin membrane to vibrate, producing sound waves that /


EC 217 MEASUREMENTS AND INSTRUMENTATION Chapter #2 Electromechanical Indicating Instrument.

it can rotate freely in the air gap. C ONSTRUCTION OF D ’ ARSONVAL GALVANOMETER ( CONT.) The pointer attached indicates the angular deflection of the coil and therefore the current through the coil. Two phosphor bronze conductive springs provide the calibrated force opposing the moving coil torque. Current is conducted to and from the coil by the control springs. T HEORY OF OPERATION ( CONT.): Current from a/


S A D A R S Stevenage And District Amateur Radio Society

of the Digital Multimeter (DMM), galvanometers such as the moving coil meter, were the main way of measuring electrical quantities. Here, a coil is suspended in a permanent magnet field and when a current is passed through that coil it generates its own magnetic field/ exist between them. With the aid of a spring and pivots, the coil rotates with respect to the permanent magnet and a pointer attached to the coil also moves. Galvanometer – a device that responds to the application of an electrical current S /


DC & AC Meters. EKT451 CHAPTER 4. 4.1 Introduction to Meters. 4.2 Analogue Meter 4.3 Introduction to DC Meters. 4.4 D ’ Arsonval Meter Movement in DC.

The first meter movements built were known as galvanometers, and were usually designed with maximum sensitivity in mind. Figure 4.2: Voltmeter Figure 4.1: Galvanometer. Cont’d…  A very simple galvanometer may be made from a magnetized needle (/ two basic arrangements: (1) Based on DC movement designs. (2) Engineered specifically for AC use.  Permanent-magnet moving coil (PMMC) meter movements will not work correctly if directly connected to alternating current, because the direction of needle movement will/


CHAPTER 31) FARADAY’S Law 31.1) FARADAY’S LAW OF INDUCTION This chapter deals with electric fields produced by changing magnetic fields. To see how an.

changing magnetic field – consider a loop of wire connected to a galvanometer (Figure (31.1)). When a magnet is moved toward the loop, the galvanometer needle deflects in one direction (Figure (31.1a)). When the magnet is moved away from the loop, the needle deflects in the opposite direction /hence, the induced emf can be expressed as : (31.3) Example (31.1) : One way to Induce an emf in a coil A coil consists of 200 turns of wire having a total resistance of 2.0 . Each turn is a square of side 18 cm, and /


1 Magnetism Outline Prepared for BW Physics by Dick Heckathorn 16 April 2 K + 12.

. 3 D 3 page 127 125 That’s all there is folks! 126 Demonstration #1 Move a wire through the jaws of a horseshoe magnet. Results? Large magnet – wire – Galvanometer 127 Demonstration #2 Plunge a bar magnet into and out of the core of a coil. Bar magnet – coil – wire – Galvanometer 128 Demonstration #3 Close the switch. Green or large power source – iron ring or/


1Physics is Life Chapter 25 and Chapter 26 Magnetism and the Forces Exerted by Magnetic Fields.

property of all matter To investigate the nature of the force exerted by a magnetic field on electric currents and moving charges To learn how magnetic forces are used in meters to measure electric currents To understand how magnetic forces enable us/or wire that is connected in parallel with the coil of the galvanometer. 44Physics is Life Voltmeter A voltmeter is made of a galvanometer by putting a coil of high resistance wire in series with its movable coil. 45Physics is Life 46 Simple Motor An electric /


Lecture 1-1 Coulomb’s Law Charges with the same sign repel each other, and charges with opposite signs attract each other. The electrostatic force between.

1-23 Galvanometer Inside Ammeter and Voltmeter Ammeter: an instrument used to measure currents Voltmeter: an instrument used to measure potential differences galvanometer shunt resistor galvanometer Galvanometer: a /Therefore,  B x . Lecture 1-32 Sources of Magnetic Fields Permeability constant Moving point charge: Bits of current: I Biot-Savart Law also The magnetic field “/ the field within a conducting loop (or coil). Changing the area of the loop (or coil) that lies within the magnetic field. Changing/


Magnetism.

always perpendicular to both the magnetic field lines and the velocity of the charged particle. 36.6 Magnetic Forces on Moving Charged Particles The deflecting force is different from other forces, such as the force of gravitation between masses, the electrostatic/. 36.8 Meters to Motors A common galvanometer consists of a stationary magnet and a movable coil of wire. 36.8 Meters to Motors A common galvanometer consists of a stationary magnet and a movable coil of wire. A multimeter can function as /


Asymmetries in Maxwell’s Electrodynamics W. J. Wilson Department of Engineering & Physics University of Central Oklahoma Edmond, OK 73034 Web: www.physics.uco.edu/wwilsonwww.physics.uco.edu/wwilson.

induced electric field, according to Maxwells equations: B = Const.  ∂B/∂t = 0  E = 0 However, the galvanometer needle is equally moving left and right. This phenomenon is now explained by the Lorentzs force: F = q v x B that acts on free electrons of the coil. Moving Coil This is obviously inconsistent being that the two last cases are equivalent and they should be described/


Chapter 31 Faraday’s Law 31.1 Faraday’s Law of Induction

polarities of magnetism in the coil iii) the direction of current through the galvanometer and hence the deflection in the galvanometer iv) that the induced current (e.m.f) is available only as long as there is relative motion between the coil and the magnet Note: i) coil can be moved by fixing the magnet ii) both the coil and magnet can be moved (towards each other or/


Operator Generic Fundamentals Components - Sensors and Detectors 1

branches Figure: Unbalanced Bridge Circuit ELO 1.4 Balanced Bridge Circuit Uses galvanometer to compare RTD resistance with that of fixed resistor Galvanometer uses pointer that deflects on either side of zero when resistance of arms/ slidewire movement causes resistance change Inductance type transducer uses coil, movable magnetic core and pressure sensing element, pressure causes element and core to move inside coil, changes in coil conductance changes current flow Review the terminal objectives and /


Presentation on Electrical measurements & measuring instruments.

very sensitive instrument with the type of center-zero scale. The torque equation for a galvanometer is exactly as discussed in the previous section. The most sensitive moving-coil galvanometer use taut- band suspension, and the controlling torque is generated by the twist in the suspension ribbon. 3 – With the moving-coil weight reduced to the lowest possible minimum for greatest sensitivity, the weight of t/


Sears and Zemansky’s University Physics. 28 Magnetic of Field and Magnetic Forces 28-1 INTRODUCTION The most familiar aspects of magnetism are those associated.

consider a more detailed series of experiments with the situation shown in Fig. 30-2. We connect a coil of wire to a galvanometer, then place the coil between the poles of an electromagnet whose magnetic field we can vary. Heres what we observe: 1. When/ the rate of change of magnetic flux, you first have to understand what is making the flux change. Is the loop or coil moving? Is it changing orientation? Is the magnetic field changing? Remember that its not the flux itself that counts, but its rate of/


Chapter 2 Electromagnetism. Chapter 2 Bellringers Friday 9/11/09 What do you know about magnets? North and south poles North and south poles attract Like.

this magnetic field Maglev (magnetic levitation) trains are pulled down the track by an electromagnet Solenoids Solenoid- coil of wire that produces a magnetic field when carrying electric current. Magnetic field produced by a solenoid can /instant he connected or disconnected the wire to the battery, the galvanometer pointer moved. As long as battery was fully connected, no electric current was measured by the galvanometer. Electric current is ONLY made when magnetic field is changing. Electromagnetic/


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