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 q v)/( 2 pi d )`
B. `( mu _(0) I qv)/( pi d )`
C. `( 2 mu _(0) I qv )/( pi d)`
D. 0

Answer

D