Question

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

• A. No current will be induced
• B. The current will be clockwise
• C. The current will be anti-clockwise
• D. The current will change direction as the electron passes by

Answer 1

The correct option is D The current will change direction as the electron passes by

As the electron moves from A to B, the direction of current will be from B to A. When an electron comes closer to the loop, the magnetic field increases and hence the direction of the induced current will be such that it opposes the change, i.e., the current will be anti-clockwise. But when the electron goes far from the loop, the magnetic field decreases and hence, the induced current in the loop will be clockwise. Thus, the direction of the induced current in the loop will change as the electron passes by.
Hence, the correct answer is option (4).