Consider 2 parallel wires with currents running down them in the same direction.

Question

Consider 2 parallel wires with currents running down them in the same direction. The first fixed in place unable to move. The second is allowed to move. They exert an attractive magnetic force on one another, and the second wire moves towards the first. The second moves and speeds up, work is done. In Ch27, we said that magnetic fields do no work on moving changed particles. Is this statement violated in this situation? Explain in 100 words or less by talking about the forces involved and where the energy comes from.

Explanation / Answer

a)

No, no work is done on the charges particles

The magnetic force is perpendicular to the motion of charges(or along the length of the wire). So, the work done is 0 along the direction of motion.

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