The figure shows a long fixed wire AB carrying constant current I. Another wire XY parallel to AB of mass per unit length $\lambda$ is kept at a distance r from wire AB connected to a capacitor of capacitance C by flexible light wires through a switch. The capacitor is initially charged to voltage ${\text{E}}_{\text{0}}$ . The switch is closed at t = 0 and the circuit has a negligible. The velocity of the wire XY, just after closing the switch will be