A Bar Magnet Is Dropped Through a Loop of Copper

question 73

Multiple Choice

A bar magnet is dropped through a loop of copper wire as shown. Recall that magnetic field lines point away from a north pole and toward a south pole. If the positive direction of the induced current I in the loop is as shown by the arrows on the loop, the variation of I with time as the bar magnet falls through the loop is illustrated qualitatively by which of the following graphs? The time when the midpoint of the magnet passes through the loop is indicated by C.

• A) 1
• B) 2
• C) 3
• D) 4
• E) 5

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