Suppose you were asked to demonstrate electromagnetic induction. Which of the following situations will result in an electric current?
A. A magnet is moving toward a wire loop.
B. A wire loop is moving away from a magnet.
C. A wire loop is rotated near a magnet.
D. All of the above
D. All of the above. When a wire loop is moved or rotated in a magnetic field, there is a change in magnetic flux which produces emf in wire loop and hence electric current is produced.
The answer is D. It is obvious since it is a one-choice question and both A and B state the exact same thing. Therefore the answer has to be D and so C has to be correct as well. Exam techniques! :D
