In the figure,two solenoids are approaching each other with speed v as shown.The induced current through the resistor R is
A) from a to b.
B) from b to a.
C) There is no induced current through the resistor.

Question

In the figure,two solenoids are approaching each other with speed v as shown.The induced current through the resistor R is 
A) from a to b. 
B) from b to a. 
C) There is no induced current through the resistor.

Quizplus · Accepted Answer

When the solenoids approach each other, their magnetic fields add up in the region between them. This change in magnetic flux produces an induced EMF in the loop formed by the resistor R, according to Faraday's law. The induced EMF causes a current to flow in the loop. By applying Lenz's law, the direction of the induced current is such that it opposes the change in magnetic flux that produced it. Therefore, the current flows from point a to point b, creating a clockwise current loop.

In the Figure,two Solenoids Are Approaching Each Other with Speed