Answer to Question #112695 in Electric Circuits for em

Question

A bar magnet is positioned near a coil of wire, as shown to the right. What is the direction of the
magnetic field induced in the coil when the magnet is moved a) to the left, and b) to the right?

Answer 1

According to Lenz’s law the direction of the induced emf is such that it opposes the change in magnetic flux responsible for its production.Since North Pole of bar magnet is receding away from the coil so the right end of the coil will develop South Pole i.e. induced current as seen from the left end will be anticlockwise. Again, since South Pole is pushing towards the second coil so the left end of the coil will develop South Pole in order to repel it and decrease the flux i.e. induced current as seen from the left end will be clockwise