Two thin, long, parallel wires, separated by a distance `d` carry a current of `i` A in the same direction. They will

Options

A. Attract each other with a force of `mu_(0)i^(2)//(2pi d^(2))`
B. Repel each other with a force of `mu_(0)i^(2)//(2pi d^(2))`
C. Attract each other with a force of `mu_(0)i^(2)//(2pi d)`
D. Repel each other with a force of `mu_(0)i^(2)//(2pi d)`

Answer

C

Explanation

`((F)/(l))=(mu_(0))/(4pi).(2i_(1)i_(2))/(a)implies((F)/l)=(mu_(0))/(4pi).(2i^(2))/(d)=(mu_(0)i^(2))/(2pid)` (Attractive)