PHYSICS · Multi-part · CBSE · Physics · Alternating Current · Alternating Current
Problem
The table below shows the variation of r.m.s. current with frequency for a certain series RLC circuit when the applied r.m.s. voltage is 12 V.
Frequency (kHz): 1.0 1.5 2.0 2.5 3.0
Current (mA): 18 24 30 24 18
(i) From the data, identify the resonant frequency of the circuit.
(ii) The capacitance used in the circuit is 0.10 μF. Calculate the inductance.
(iii) Using the current at resonance, determine the resistance present in the circuit.
(iv) Using your calculated values of L and R, compute the current expected at 3.0 kHz and compare it with the measured value. Comment on the agreement.