LECT15_1981910

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

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Unformatted text preview: 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 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 I 2 /2 π d)I 1 l Rewrite in terms of force per unit length: 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 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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This note was uploaded on 09/30/2011 for the course PHYS 1B taught by Professor Briankeating during the Summer '07 term at UCSD.

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

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