First slide

AC Circuits

Question

Choke coil is used to control

Easy

A

ac
B

dc
C

Both ac and dc
D

Neither ac nor dc

Solution

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

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