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 V_L across the inductor was measured from the moment the magnet was released. Choose all that are correct from the following. If the number of the turns N is doubled, the maximum value of V_L becomes twice larger. With a given set of an inductor and a bar magnet, if the experiment is repeated on the Moon, the maximum value of V_L will still be the same as that measured on the Earth. With a given inductor, if a stronger bar magnet is used V_L becomes larger. With a given bar magnet, if an inductor with a larger self-inductance is used the maximum value of V_L will be larger.

Answer 1

First option is correct because more change in flux would takes place.

Second option is incorrect because acceleration changes.

Third option is correct because stronger magnetic field would increase voltage.

Fourth option is incorrect as self inductance comes into effect when external current flows through it.