Currents of `10A, 2A` are passed through two parallel wires `A` and `B` respectively in opposite directions. If the wire `A` is infinitely long and the length of the wire `B` is 2 metre, the force on the conductor `B`, which is situated at `10cm` distance from `A` will be

Options

A. `8xx10^(-5)N`
B. `4xx10^(-5)N`
C. `4xx10^(-1)N`
D. `8xx10^(-7)N`

Answer

A

Explanation

`F=(mu_(0))/(4pi)*(2i_(1)l_(2))/(d) =((2)(3)(2xx10^(-7))(10))/(0.1)xx8xx10^(-5)N`