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For an A.C. L-C-R series circuit at reso...

For an A.C. L-C-R series circuit at resonant frequency, which of the following is wrong ?

A

Value of resistance is zero

B

Magnitude of reactance due to L and C are equal

C

Phase change due to L is equal and opposite to phase change due to C

D

Impedance has only real component.

Text Solution

Verified by Experts

The correct Answer is:
A
For resonant frequency `WL-1/(omegac)=0`
Hence in L-C-R, A.C. circuit impedance
`|z|=sqrt(R^2+(omegaL-1/(omegac))^2)`
|z|=`sqrtR^2`
`therefore` |z|=R
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