Question

1. Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer
while coil B is connected to a battery through a key. What would happen if :
(i) a current is passed through coil B by plugging the key ?
(ii) the current is stopped by removing the plug from the key ?
Explain your answer mentioning the name of the phenomenon involved.​

Answer 1

Answer:

i)if the current is passed through the coil B by plugging the key , the galvanometer will show a deflection until the flow of current becomes steady .

ii)if the flow of current is stopped in the coil B then again galvanometer of coil A will show deflection for a short time.

The Phenomenon is Electromagnetic Induction.

Explanation:

Whenever current is passed through a coil , it creates a magnetic field around it . But to induce current in another coil , there has to be a relative change in the magnetic field .

All the field lines together are called magnetic flux . So to induce a current there has to be change in the flux associated with the coil . The greater the rate of change of the flux , the larger is the current induced .