As illustrated in the figure below, a bar magnet was initially held stationary i
ID: 1537936 • Letter: A
Question
As illustrated in the figure below, a bar magnet was initially held stationary inside an inductor for a long time, and then released and the magnet fell out of the inductor by the action of the Earth's gravity. The inductor is made out of circular loops of wires. The number of turns in the inductor is N, the self inductance of the inductor is L, and the inductor is much bigger than the size of the magnet in both the length and the diameter.
The voltage VL across the inductor was measured from the moment the magnet was released. Choose all that are correct from the following.
a)With a given inductor, if a stronger bar magnet is used VL becomes larger.
b)If the number of the turns N is doubled, the maximum value of VL becomes twice larger.
c)With a given set of an inductor and a bar magnet, if the experiment is repeated on the Moon, the maximum value of VL will still be the same as that measured on the Earth.
d)With a given bar magnet, if an inductor with a larger self inductance is used the maximum value of VL will be larger.
UniExplanation / Answer
The correct statements are
a)With a given inductor, if a stronger bar magnet is used VL becomes larger.
Because current will be more, V = IR
b)If the number of the turns N is doubled, the maximum value of VL becomes twice larger.
Current depends on number of turns V = IR
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