Page 3 - LN

 When the switch is off in the primary coil, magnetic field in coil B also change and
the galvanometer shows deflection in the opposite direction.

Experiment 3:

From the above two experiments, it was concluded by Faraday that the relative motion
between the magnet and the coil resulted in the generation of current in the primary coil.
But another experiment conducted by Faraday proved that the relative motion between
the coils was not really necessary for the current in the primary to be generated. In this
experiment, he placed two stationary coils and connected one of them to the
galvanometer and the other to a battery, through a push button. As the button was
pressed, the galvanometer in the other coil showed a deflection, indicating the presence
of current in that coil. Also, the deflection in the pointer was temporary and if pressed
continuously, the pointer showed no deflection and when the key was released, the
deflection occurred in the opposite direction.

 DEFINATION:
 The process of producing induced current in a closed circuit or in a coil by
changing the magnetic field linked with the coil is known as electromagnetic
induction.
 Whenever there is a relative motion between a magnet and a coil, a current is
induced in the coil due to the change in the magnetic field associated with it. This
process of producing induction current is known as electromagnetic induction.
 Induced current is the current produced by change in magnetic flux. According
to FARADAY'S LAW when there is change in magnetic flux over wire, then
a current is is produced in the wire, such current is called induced current.
The strength of the induced current directly depends upon the following factors.

 Strength of the magnetic field.
 Number of the turns in the coil.
 Relative speed between the coil and the magnet.