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

Options

A. `(mu_(0) i^(2))/(b^(2))`
B. `(mu_(0) i^(2))/(2 pi b)`
C. `(mu_(0)i)/(2pi b)`
D. `(mu_(0) i)/(2pi b^(2))`

Answer

B

Explanation

`(F)/(I) = (mu_(0) i^2)/(2pi b)`