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Questions  

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

a
μ0i2b2
b
μ0i22πb
c
μ0i2πb
d
μ0i2πb2

detailed solution

Correct option is B

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

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