Question

describe how induction would occur in each of the following circuits. (A, B, C)

magnet main coil switch battery ammeter main coil secondary coil battery ammeter 1 switch

Answer 1

A) When the magnet enters into the coil, the magnetic flux linked with the coil increases. So there will be an induced current and a reading in the ammeter. Similarly when the magnet leaves the coil, there will be a decrease in the magnetic flux, again a current will be in the ammeter. Here the process is electromagnetic induction.

B) Here when there is an increase in the current flow during the switch is on, an increase in magnetic flux will be there. Thus an induced current will flow through it. If the switch is becoming off, a decrease in magnetic flux. So there will be decrease in magnetic flux, hence an induced current will flow through the ammeter.Here the process of developing induced current by its own. So it is called self induction.

C) When the current flows through the main coil, there will be increase in magnetic flux in the main coil. And the secondary coil is in the region of change in magnetic flux. Thus there will be an induced emf in the secondary coil also. This process is called mutual induction.