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For series LCR circuit, correct statemen...

For series LCR circuit, correct statements are

A

Applied e.m.f. and potential difference across resistance may be in phase

B

Applied e.m.f. and potential difference at inductor coil have phase difference of `pi//2`

C

Potential difference across resitance and capacitor have phase difference of `pi//2`

D

Potential difference at capacitor and inductor have phase difference of `pi//2`

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