Two thin long parallel wires seperated by a distance 'b' are carrying a current ' I' amp each . The magnitude of the force3 per unit length exerted by one wire on the other is

Options

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

Answer

B

Explanation

Force per unit length `= (mu_(0))/(4pi) , (2i_(1) i_(2))/(r) = (mu_(0))/(2pi), (i^(2))/(b)`