In the figure,a bar magnet moves away from the solenoid.The induced current through the resistor R is

Question

Quizplus · Accepted Answer

According to Faraday's law of electromagnetic induction, a changing magnetic field will induce an electromotive force (EMF) and hence an induced current in a closed loop. When the bar magnet moves away from the solenoid, the magnetic field through the solenoid decreases, which creates an EMF and an induced current in the solenoid in a direction to oppose the change in the magnetic field. This induced current creates a magnetic field in the opposite direction to the bar magnet's field, and as a result, the north pole of the solenoid becomes the south pole, and vice versa. This induced magnetic field also cuts across the resistor, which creates an induced EMF and an induced current through it from a to b.

In the Figure,a Bar Magnet Moves Away from the Solenoid