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Question

Two thin long parallel wires separated by a distance b are carrying a current i amp each. The magnitude of the force per unit length exerted by one wire on the other is

A
μ0i2b2
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B
μ0i22πb
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C
μ0i2πb
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D
μ0i2πb2
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Solution

The correct option is B μ0i22πb
Force per unit length =μ04π.2i1i2r=μ02π.i2b

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