Answer the following questions with regard to the diagram above. If the first is

Question

Answer the following questions with regard to the diagram above. If the first is T and the rest F, enter TFFFF.

A) In the absence of friction between rod and rail, a constant force is still required to keep the rod moving to the right with the same velocity.

B) The magnetic field due to the INDUCED current points within the loop ABCD into the plane of the paper.

C) The induced current flows clockwise.

D) As the rod AB moves to the right, the magnitude of the flux through the surface ABCD decreases.

E) The agent moving the rod to the right must be doing zero work on the rod

Explanation / Answer

The rod moves to the right. As a consequence, the magnitude of the enclosed magnetic flux is reduced. Lenz' law indicates that the induced current will generate a magnetic field that opposes this change. The induced current will thus produce a magnetic field that is directed into the paper. The induced current will therefor need to flow clockwise. Inside the rod the current will flow from B to A. The magnetic force acting on the rod will therefor be directed towards the left and if the rod is moving with a constant velocity, a constant force directed towards the right must be supplied. Thus:

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