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.