Question

If you drop a bar magnet down a tube made of conducting material (like copper or aluminum) something interesting happens: the bar magnet does not simply accelerate all the way down under the influence of gravity. Instead, there are forces that oppose the motion and cause the bar magnet to descend at essentially a constant velocity. Suppose you do this two times: once with the north pole of the magnet facing down and the second time with the north pole facing up. Note that for the purposes of orientation, imagine you are looking down the tube as the magnet descends and moves away from you.

Which combination of options below is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"]

A) Magnetic forces will slow the magnet down both times.
B) During the first drop, the part of the tube below the magnet develops a clockwise current.
C) During the first drop, the part of the tube above the magnet develops a counterclockwise current.
D) During the second drop, the part of the tube above the magnet develops a counterclockwise current.
E) None of the above

Answer 1