A Circuit Is Pulled with a 21-N Force Toward the Right

Multiple Choice

A circuit is pulled with a 21-N force toward the right to maintain a constant speed v.At the instant shown,the loop is partially in and partially out of a uniform magnetic field that is directed into the paper.As the circuit moves,a 4.0-A current flows through a 6.0- resistor.

-Which one of the following statements concerning this situation is true?

A) The temperature of the circuit remains constant.
B) The induced current flows clockwise around the circuit.
C) Since the circuit moves with constant speed,the force F does zero work.
D) If the circuit were replaced with a wooden loop,there would be no induced emf.
E) As the circuit moves through the field,the field does work to produce the current.