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HW7 due on Friday Turn in HW6 Stand by to receive back HW5 EXAM 2 coming up on Monday !!!!! March 30 th
Magnetic field due to a long (straight) wire: Let’s review:
current on ( I up ! ).
Right hand rule (#1)
( I up/out ! ). DIRECTION-OK MAGNITUDE???
Experiment shows: For a long straight wire
Example: Suppose a cable is carrying 100 A current. What’s the B-field 1 cm from the cable? How about 10 cm?
Example: The cables are each carrying 25 A out the of page. What’s at point Q? 13.0 cm Q
Example: The cables are carrying 25 A out the of page. What’s at point P? Superposition! Next … 13.0 cm P
P Example: The cables are each carrying 25 A out the of page. What’s at point Q?
P Now: Vector Superposition! Next …
Example: The cables are each carrying 25 A out the of page. What’s at point Q?
Forces between current-carrying conductors
Opposite Currents Repel!
Parallel Currents attract! (same magnitude as other case!)
Example: What force per unit length do two cables 1 cm apart produce on each other? (They’re carrying 50 A each.) How about at 10 cm?
What about currents perpendicular to each other? …
Fun example: Force/m?
Fun example: How much current do you need in the third wire so the net forces are zero?
Current Loop: up/out down/in Solenoids
Current LoopS: up/out down/in
Solenoid: up/out down/in
Example: What’s the B-field inside a coil with 50 turns/cm, running a current of 2 A?
Magnetic Force Acting on a Current-Carrying Conductor.
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Magnetic Fields and Forces AP Physics B. Facts about Magnetism Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create.
Course no: EE 3107 Md. Nur Kutubul Alam Lecturer Department of EEE Khulna University of Engineering and Technology Khulna-9203 Bangladesh.
Chapter 29 Magnetic Fields. Quick Quiz 29.1 The north-pole end of a bar magnet is held near a positively charged piece of plastic. The plastic is (a)
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Statics (MET 2214) Prof. S. Nasseri Forces and Moments MET 2214.
Straight line currents. Φ1Φ1 Φ2Φ2 Loop Wire …we have a bundle of straight wires and some of the wires passes through the loop… I1I1 I2I2 I3I3 I4I4 I5I5.
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