Question

Through two parallel wires `x` and `y`, currents of `10 A` and `20 A` respectively are passing in opposite directions. `x` is infinitely long and `y` has a length of `2 m`. The distance between them is `10 cm`. The magnetic force on `y` is
A. `4 xx 10^(-5) N`
B. `4 xx 10^(-6) N`
C. `8 xx 10^(-4) N`
D. `8 xx 10^(-6) N`

Answer 1

Correct Answer - C

`F = (mu_(0)i_(1)i_(2))/(2pi d)L = (2 xx 10^(-7) xx 10 xx20 xx 2)/(0.1)`
`= 8 xx 10^(4) N`(repulsive)