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

As the solenoids are approaching each other, the magnetic flux through the loop will increase. According to Faraday's law of electromagnetic induction, this will induce a current in the direction that opposes the change in flux. In this case, the induced current will flow from a to b, opposing the increasing magnetic flux.

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