when the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the…

when the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. the magnet is then pulled out at a faster speed. what will be the result?\n a larger current in the same direction\n a larger current in the opposite direction\n a smaller current in the same direction\n a smaller current in the opposite direction

when the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. the magnet is then pulled out at a faster speed. what will be the result?\n a larger current in the same direction\n a larger current in the opposite direction\n a smaller current in the same direction\n a smaller current in the opposite direction

Answer

Brief Explanations:

According to Faraday's law of electromagnetic - induction, the induced electromotive force (emf) is proportional to the rate of change of magnetic flux. When the magnet is pulled out faster, the rate of change of magnetic flux through the solenoid is larger in magnitude and in the opposite direction compared to when it was inserted. Larger rate of change of flux means a larger induced emf and thus a larger current. Also, Lenz's law states that the direction of the induced current opposes the change in magnetic flux. When inserting the north - pole, a current is induced in one direction, and when pulling it out, the current is in the opposite direction.

Answer:

a larger current in the opposite direction