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Two thin long parallel wires separated b...

Two thin long parallel wires separated by a distance 'd' carry current 'I' each. The magnitude of the force per unit length exerted by one wire on the other is______

A

`(mu_0i^2)/(2pid)`

B

`(mu_0i^2)/(4pid)`

C

`(mu_0i)/(2pid)`

D

`(mu_0i)/(4pid)

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