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In a series LCR circuit, at resonance th...

In a series LCR circuit, at resonance the

A

the phase difference between current and voltage is `90^@`

B

the phase difference between current and voltage is `45^@`

C

its impedance is purely resistive

D

the current is minimum

Text Solution

Verified by Experts

The correct Answer is:
C
In series LCR, the impedance of the circuit is given by `Z = sqrt(R^2 + (X_L - X_C)^2)`
At resonance , `X_L = X_C therefore Z =R`
At resonance , the phase difference between the current and voltage is `0^@` . Current is maximum at resonance .
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