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Q.

A choke coil is preferred to a rheostat in ac circuit as

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a

It consumes almost zero power

b

It increases current

c

It increases power

d

It increases voltage

answer is A.

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Detailed Solution

A choke coil contains high inductance but negligible resistance, due to which power loss becomes appreciably small.
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A choke coil is preferred to a rheostat in ac circuit as