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  • Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.

Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.

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Solution:
When magnetic field passing through any coil changes it causes an electromagnetic force in the coil.
This electromagnetic force produces current in the coil. This phenomenon is called electromagnetic induction.
Whether the magnetic field through coil is increasing or decreasing, it will cause induced current in the coil.
The sense of current will be different for decreasing or increasing magnetic field.
In the given diagram, if we switch on the circuit of left coil, the current in left coil will increase.

We know that current carrying wire produces magnetic field, therefore magnetic field due to left coil will increase and cause induced current in the right coil.
Similarly if we open the switch of the left circuit, the magnetic field decreases because of it.
This change will again cause the induced current in the right coil.
But this time direction of current will be reversed.
This experiment clearly demonstrates that whether magnetic field decreases or increases through any coil, it will cause induced current.

 

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