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SAT Subject Test
A bar magnet is located next to a coil of wire that is fixed in position and connected to an ammeter , as shown above. There will be an induced electric current through the ammeter if the magnet is moving in which of the following ways?
I. | Toward the coil with constant speed |
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II. | Toward the coil with increasing speed |
III. | Away from the coil with constant speed |
IV. | Away from the coil with increasing speed |
Select an Answer
or
only
Correct Answer:
No
or
only
Correct Answer:
No
or
only
Correct Answer:
No
or
only
Correct Answer:
No
or
or
or
Correct Answer:
Yes
View Correct Answer
The correct answer is all four motions. Since the magnetic field extending from the end of the bar magnet is non-uniform, any motion of the magnet will cause a change in the magnetic flux passing through the coil. This, in turn, causes an induced emf and thus a current in the coil.
Question Difficulty:
hard