a conducting bar of length L=.5m is moving with a constant speed of 4m/s on two conducting rails which are connected at some point by a conducting...

a conducting bar of length L=.5m is moving with a constant speed of 4m/s on two conducting rails which are connected at some point by a conducting bar that is not moving.

The resistance of the rails is R=2 ohm.

The whole arrangement is in a into-the-page magnetic field of 3 tesla.

A) what is the induced current and in which direction does it flow?

B) What is the force needed to keep the bar moving at a constant speed of 4m/s? Include direction.