Question

Given below are two statements:
Statement I: In an LCR series circuit, current is maximum at resonance.
Statement II: Current in a purely resistive circuit can never be less than that in a series LCR circuit when connected to the same voltage source.
In the light of the above statements, choose the correct from the options given below.

• A. Statement I is true but Statement II is false
• B. Statement I is false but Statement II is true
• C. Both Statement I and Statement II are true
• D. Both Statement I and Statement II are false

Answer 1

Answer: (C)

Both Statement I and Statement II are true

Answer 2

Statement-I: $I_m = \frac{V_m}{\sqrt{R^2 + (X_L - X_C)^2}}$ At resonance, $X_L = X_C$, so: $I_m = \frac{V_m}{R}$

Thus, the impedance is minimum, and therefore, $I$ is maximum at resonance.

Statement-II: $I = \frac{V}{R}$ In a purely resistive circuit.

Hence, in a purely resistive circuit, the current cannot be less than that in a series LCR circuit.

Thus, both Statement I and Statement II are true.