CourseNotes.38 - 10.2 Force Between Two Parallel Currents...

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Unformatted text preview: 10.2 Force Between Two Parallel Currents Magnetic fields were first discovered by studying the force between two current carrying wires. We saw in the last section that when a long straight wire is carrying current, it will produce a magnetic field around itself. If we then place another current carrying wire in that magnetic field, we know from last chapter that it will feel a force due to the field. The calculations of the forces between the two wires is very straightforward. We simply start by calculating the field of either wire and then by calculating the force that that field exerts on the other wire. As an example, consider two wires a distance d apart and carrying equal currents running in the same direction. The magnetic field of the right hand wire is B = μ i 2 πd pointing upwards at the left hand wire. A section of length L on the left hand wire then feels an attractive force F = iLB = μ i 2 L 2 πd Hence, the force per unit length of one wire on the other is F L = μ i 2...
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This note was uploaded on 12/05/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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