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  4. A choke coil is used in :

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Q. A choke coil is used in :

J & K CETJ & K CET 2000

Solution:

In a direct circuit, the current is reduced by means of a rheostat.
This results in a loss of electrostatic energy per second as heat. The current in an alternating current circuit may however, be reduced by means of a device which involves little loss of energy. This device is called a choke coil.