Page 396 - Basic Electrical Engineering

At resonance,

or,

or,

Substituting values,

Since X = X , the value of impedance at = R.
C
L

Maximum value of current,

–6
At a frequency of 100 Hz, C = 200 × 10 F, current is reduced to half, i.e.,
impedance becomes equal to twice its value at resonance, i.e., equals 2R.

Impedance,

Current,

According to the problem