In this experiment, a magnet of length L is dropped so the front end is at heigh

Question

In this experiment, a magnet of length L is dropped so the front end is at height H from the coil, and you get a graph with two peaks. Each question changes the procedure, and we wish to compare the height of the peaks on new graph to the height of the peaks in the original graph.

a) Suppose a second identical magnet is placed side by side with the first, with the north pole of each next to the south pole of the other. If the pair of magnets is now dropped from height H, how will the graph compare to the original graph?

b) Now, suppose the two identical magnets are again placed side by side with the first, but now the two north poles are next to each other and the two south poles are next to each other. If the pair of magnets is dropped from height H, how will the graph compare to the original graph?

c) Now, suppose one magnet is held fixed and the coil is dropped from height H, Assume the coil falls so the magnet passes through the center. How will the graph compare to the original graph?

d) Next: suppose the original experiment is done on the Moon, where g, the acceleration due to gravity, is about one-sixth of g on Earth. If the magnet is dropped from height H, how will the graph compare to the original graph?

e) Finally: if you increase the height H, what will happen to the graph?

Explanation / Answer

a) both peaks will be nearly zero

Reason: This configuration will reduce the magnetic field to almost zero. No flux through the coil. Hence no emf or no peaks.

b) both peaks will be more than before

Reason: This configuration will double the magnetic field. Hence higher peaks.

c)   both peaks will be the same as before

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