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Question

A long wire A carries a current of 10 amp. Another long wire B, which is parallel to A and separated by 0.1 m from A, carries a current of 5 amp in the opposite direction to that in A. What is the magnitude and nature of the force experienced per unit length of B
[μ0=4π×107weber/ampm]

A
Repulsive force of 104N/m
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B
Attractive force of 104N/m
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C
Repulsive force of 2π×105N/m
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D
Attractive force of 2π×105N/m
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Solution

The correct option is A Repulsive force of 104N/m

By using Fl=μ04π.2i1i2a
Fl=107×2×10×50.1=104N
Wires are carrying current in opposite direction so the force will be repulsive.


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