Question

Two circular loops of equal radii are placed coaxially at a some separation. The first is cut and a battery is inserted in between to drive a current in it. The current changes slightly because of the variation in resistance with temperature. During this period, the two loops

• A. attract each other
• B. repel each other
• C. do not exert any force on each other
• D. attract or repel each other depending on the sense of the current

Answer 1

The correct option is A attract each other

When two circular loops of equal radii are placed co-axially and one coil is connected to battery than current start to flow in coil due to this temperature of coil will start increasing as temperature is directly proportional Resistance than resistance of coil will also increase. When resistance will start increase than current flow will be decrease, and flux will also be decrease. To balance the flux both coil will attract each other.

Correct option is A