A bar magnet is held above the center of awire loop in a horizontal plane, as sh

Question

A bar magnet is held above the center of awire

loop in a horizontal plane, as shown. Thesouth

end of the magnet is toward the loop.The

magnet is dropped. Find the direction ofthe

current in the resistor as viewed from above(a)

while the magnet is falling toward the loopand

(b) after the magnet has passed throughthe

loopand moved away from it.

A bar magnet is held above the center of awire loop in a horizontal plane, as shown. Thesouth end of the magnet is toward the loop.The magnet is dropped. Find the direction ofthe current in the resistor as viewed from above(a) while the magnet is falling toward the loopand (b) after the magnet has passed throughthe loopand moved away from it.

Explanation / Answer

   a.   As the magnet drops towardsthe loop, it behaves as south pole to oppose the fall of magnet, sothe current must be clockwise as seen from the magnet.    b.   Lower end must behave assouth pole to oppose north pole of magnet going away, so thecurrent must be clockwise as seen from the magnet ( anticlockwiseas seen from above).

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