Question

A small circular ring is kept inside a larger loop connected to a switch and a battery as shown. The direction of induced current when the switch is made (i) ON (ii) OFF after it was ON for a long time is:

• A. clockwise, anti-clockwise
• B. clockwise, clockwise
• C. anti-clockwise, clockwise
• D. anti-clockwise, anti-clockwise

Answer 1

The correct option is A clockwise, anti-clockwise

Using lenz law, it is evident that the induced current in the ring will oppose the effect caused by the current in the larger loop. When current is flowing in the larger loop a magnetic field will be set and the ring will oppose it, thus, inducing current in clockwise direction. Similarly when the switch is turned off, the induced current will be in anti-clockwise direction.