Question

In the figure X is a coil wound over a hollow wooden pipe.

A permanent magnet is pushed at a constant speed v from the right into the pipe and it comes out at the left end of the pipe. During the entry and the exit of the magnet, the current in the wire YZ will be from

Options

• Y to Z and then Y to Z

• Z to Y and then Y to Z

• Y to Z and then Z to Y

• Z to Y and then Z to Y

Answer 1

Y to Z and then Z to Y

Explanation:

As the magnet enters the pipe, the current travels from Y to Z, attempting to counteract the magnet’s entry. Upon the magnet's escape from the pipe, the current travels from Z to Y, attempting to counteract the magnet’s departure.