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Q.

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

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a

μ0i2b2

b

μ0i22πb

c

μ0i2πb

d

μ0i2πb2

answer is B.

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Detailed Solution

Force per unit length =μ04π.  2i1i2r  =  μ02π.  i2b

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