60- metal bar, 1.50 long and having a resistance of 10.0 , rests horizontally on conducting wires connecting it to the circuit shown in the figure ....

A 2.60- metal bar, 1.50 long and having a resistance of 10.0 , rests horizontally on conducting wires connecting it to the circuit shown in the figure . The bar is in a uniform, horizontal, 1.60- magnetic field and is not attached to the wires in the circuit.http://session.masteringphysics.com/problemAsset/1266176/3/27.74.jpgWhat is the acceleration of the bar just after the switch S is closed?