LECT15_1981910

# LECT15_1981910 - 19.8 Magnetic force between two parallel...

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19.8: Magnetic force between two parallel conductors Assume I 1 and I 2 are in the same direction. Wire 2 produces a B-field B 2 ; at r=d, |B 2 | is μ 0 I 2 /2 π d Wire 1 experiences a magnetic force F 1 in the presence of B 2 . (Notation: F 1 = force experienced BY wire 1) F 1 = B 2 I 1 l = ( μ 0 I 2 /2 π d)I 1 l Rewrite in terms of force per unit length:

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19.8: Magnetic force between two parallel conductors Note that F 1 is downward (attractive). F 2 on wire 2 is equal to and opposite to F 1 . Parallel wires carrying currents in the same direction ATTRACT each other. Parallel wires carrying currents in opposite directions REPEL each other.
19.9: Magnetic fields of current loops and solenoids Consider a loop of current: What is the net B like at the center of the loop? Net effect: Similar to a magnetic dipole

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19.9: Magnetic fields of current loops and solenoids Consider a loop of current: What is the net B like at the center of the loop?
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