A conducting rod AB of length 1 m is moving with uniform speed of $2\;m/s$ in a uniform magnetic field of 4T which is directed perpendicular to the plane of motion of the rod AB. A capacitor of capacity $C= 10\;\mu F$ is connected. The charge on the capacitor is

Question

$(a)\;zero\\ (b)\;is\; varying \\(c)\;is \;40\;\mu F \\(d)\;is 80\; \mu F $