First slide

Lenz's law and conservation of energy

Question

An electron moves along the line AB, which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced, in the loop?

Moderate

A

No current will be induced.
B

The current will be clockwise.
C

The current will be anticlockwise.
D

The current will change direction as the electron passes by.

Solution

As the electron is moving from left to right, the flux linked with the loop (which is into the page) will first increase and then decrease as the electron passes by. So the induced current in the loop will be first anticlockwise and will change direction as the electron passes by.

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