First slide

Phasors and Phasor Diagrams

Question

Choke coil is used to control

Moderate

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 and 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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