Magnetism Magnetic field- A magnet creates a magnetic field in its vicinity.

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Presentation transcript:

Magnetism Magnetic field- A magnet creates a magnetic field in its vicinity.

Magnetism It represents the effect a magnet has on its surroundings.

Magnetism All magnetic fields arise from the motion of electric charge.

Magnetism Magnetic field lines can be used to represent magnetic fields. The closer the lines are together, the greater the magnitude of the vector

Figure 22-4 Magnetic Field Lines for a Bar Magnet

Magnetism A magnetic field is represented by the symbol

Magnetism The direction of a magnetic field at a given location is the direction in which the north pole of a compass points when it is placed in that location.

Magnetism A charged particle moving in a magnetic field will experience a force if it has a velocity component perpendicular to the magnetic field.

Magnetism

The Magnetic Force Right Hand Rule (RHR)

Magnetism

Figure 22-8 The Magnetic Force Right-Hand Rule

Figure 22-9 The Magnetic Force for Positive and Negative Charges

Conceptual Checkpoint 22-2 Which is the positive? Negative? Zero charge?

Magnetism Velocity selector. A device with both magnetic and electric fields present. Only charged particles moving with a certain speed will pass through undeflected.

Magnetism

Conceptual Checkpoint 22-3 Which direction should the magnetic field be to give zero force?

Magnetism A charged particle moving with a velocity perpendicular to a uniform magnetic field, will move in a circle.

Figure The Electromagnetic Flowmeter

Magnetism

Figure Circular Motion in a Magnetic Field

Example 22-3 Uranium Separation

Forces on a long straight current carrying wire in a magnetic field. Magnetism

Forces on a long straight current carrying wire in a magnetic field. Magnetism

A long straight current carrying wire has charges moving inside it. Magnetism

If it is placed in a magnetic field, it will experience a force Magnetism

Figure The Magnetic Force on a Current-Carrying Wire

Direction of magnetic forces in a current carrying loop in a magnetic field. Magnetism

Figure Magnetic Forces on a Current Loop

Example 22-5 Torque on a Coil

Magnetism

To calculate the magnitude and direction of the magnetic field in the vicinity of a long straight current carrying wire. Magnetism

Apply the magnetic field right hand rule. 1.Point your thumb in the direction of current flow. 2.Curl your fingers around the wire 3.They will point in the direction of the magnetic field. Magnetism

Figure The Magnetic Field of a Current-Carrying Wire

Magnetism