A long straight wire carrying current of `30 A` is placed in an external unifrom magnetic field of induction `4xx10^(4) T`. The magnetic field is acting parallel to the direction of current. The maggnetic of the resultant magnetic inuduction in tesla at a point `2.0 cm` away form the wire is

Options

A. `10^(-4)`
B. `3 xx 10^(-4)`
C. `5 xx 10^(-4)`
D. `6 xx 10^(-4)`

Explanation

Solve by phasor
Both rotate by `60^(@)=(pi)/(3)`
Time `=(pi//3)/(omega)=(pi)/(3omega)=(pi)/(3((2pi)/(T)))=(T)/(6)`