In a series LCR circuit

PHYSICS · Single correct · CBSE · Physics · Alternating Current · Alternating Current

Problem

In a series LCR circuit, the current amplitude becomes

1/\sqrt{2}

of its maximum value at the half-power frequency. Which relation between the circuit impedance

Z

and the resistance

R

holds at this frequency? (a)

Z = \dfrac{R}{\sqrt{2}}

(b)

Z = 2R

(c)

Z = \sqrt{2}\,R

(d)

Z = R