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Q.

Choke coil is used to control

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a

ac

b

dc

c

Both ac and dc

d

Neither ac nor dc

answer is A.

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Detailed Solution

The choke coil can be used only in ac circuits, not in dc circuits, because for dc (ω = 0) the inductive reactance XL=ωL of the coil is zero, only the resistance of the coil remains effective which too is almost zero.
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