A variable frequency a.c. source is con...

A variable frequency a.c. source is connected only to a parallel plate capacitor. What is the effect on the displacment current `(I_D)`, if the frequency is decreased?

A

`I_(d)` increase

B

`I_(d)` decrease

C

`I_(d)` does not change

D

`I_(d)` varies between `0 to oo`

Text Solution

Verified by Experts

The correct Answer is:

B

Capacitive reaction `X_(C) = 1/(2pifC)`. When f si decreased,
`X_(C)` is increase and `1 prop 1/(X_C)`
`:.` Conduction current `(I_C)` decreases
`:. i_(d)` is decreased (as `I_(d)-I_(C))`.

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