a) A magnet falls through a loop of wire with the southpole entering first. As t
ID: 1723216 • Letter: A
Question
a) A magnet falls through a loop of wire with the southpole entering first. As the south pole approaches the loop, what isthe direction of the induced current in the loop (as veiwed fromabove, looking down on the magnet)? b) A magnet falls through a loop of wire with the southpole entering first. After it has fallen all the way through, sothat the north pole end is moving away from the loop, what is thedirection of the induced current in the loop (as veiwed from above,looking down on the magnet)? a) A magnet falls through a loop of wire with the southpole entering first. As the south pole approaches the loop, what isthe direction of the induced current in the loop (as veiwed fromabove, looking down on the magnet)? b) A magnet falls through a loop of wire with the southpole entering first. After it has fallen all the way through, sothat the north pole end is moving away from the loop, what is thedirection of the induced current in the loop (as veiwed from above,looking down on the magnet)?Explanation / Answer
The induced current is in such a direction that it opposes the motion of the falling magnet.
A) When viewed from above , the loop's circular surface must be south pole so that south pole opposes the south pole of the falling magnet.
The induced current is clockwise as viewed from above.
B) After passing the loop the north pole of the magnet is moving away from the loop. The current opposes this. The face of the loop underneath should be south so that it attracts the falling magnet.
The upper face of the loop must be north. The current is reversed i.e anticlockwise.
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