Two very long, straight , parallel wires carry steady currents ` I &-I` respectively . The distance between the wires is `d`. At a certain instant of time, a point charge `q` is at a point equidistant from the wires , in the plane of the wires. Its instantaneous vel,ocity ` v` is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is

Options

A. `(mu_(0) I qv)/(2pi d)`
B. `(mu_(0) I qv)/(pi d)`
C. `(2mu_(0) I qv)/(pi d)`
D. 0

Answer

D

Explanation

According to given infromation gollwoing figure can be drawn, which shows that direction of magnetic field is along the direction of motion of charge so net force on it zero.