Two coils are placed next to each other as shown in the figure above. Coil A Is

Question

Two coils are placed next to each other as shown in the figure above. Coil A Is connected to an AC current source that generates an alternating current of a fixed amplitude I_o and the angular frequency omega. A voltmeter is used to measure the voltage across the coil B, V_B The arrangement is made so that the coil A is fixed in space and coil B can be moved horizontally. Choose all that are correct from the following. At a constant value of the angular frequency omega if the coil B is brought closer to the coil A, the value of the mutual inductance will increase. While the coil B is held stationary nearby the coil A if the angular frequency omega is increased, the maximum value of the mutual inductance will increase. Detailed examination of the time varying voltage V_B and the time varying current through the coil A will show that at the moment when the voltage V_B is the maximum the current through the coil A is zero. While the coil B is held stationary nearby the coil A if the angular frequency omega is decreased, there will be no change in the maximum value of V_B. At a constant value of the angular frequency omega, if the coil B is moved away from the coil A, the maximum value of V_B will decrease. Is = l0sin(o>t)

Explanation / Answer

all r right except 4th option

when coils moved away net flux linkng will decrease and thus maximim value of induced emf will decrease

and vice versa

if angular frequency increased the rate at which magnetic flux linking will increse this further increase the maximum value of induced emf

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