What is the acceleration of the bar just after the switch S closed horizontally on conducting wires

A 2.60 N metal bar, 0.850 m long and having a resistance of 10.0 Ω, rests horizontally on conducting wires connecting it to the circuit shown in (Figure 1). The bar is in a uniform, horizontal, 1.60 T magnetic field and is not attached to the wires in the circuit.

A. What is the acceleration of the bar just after the switch S is closed?