Question

A series RLC circuit resonates at 1000 kHz. At frequency of 995 kHz, the circuit impedance is

Answer 1

Complete Question:

A series RLC circuit resonates at 1000 kHz. At a frequency of 995 kHz, the circuit impedance is

(a) resistive

(b) minimum

(c) inductive

(d) capacitive

Answer:

At a frequency of 995 kHz, the circuit impedance is (d) Capacitive

Explanation:

• A Series-RLC circuit's impedance is solely resistive and at its lowest level at the resonant frequency.
• So, during resonance, the current is at its highest level.
• The capacitive reactance rises and the inductive reactance falls as the frequency is lowered below resonance.
• At frequencies below the resonance frequency, the net reactance is capacitive, and as the frequency is further decreased below the resonant frequency, the amount of the capacitive reactance increases.
• Due to the capacitive nature of the circuit's reactive component, when the frequency drops, the current increasingly trails the applied voltage.

• The inductive reactance rises and the capacitive reactance falls as the frequency is raised above the resonance frequency.
• The net reactance is inductive and grows in magnitude with a frequency above the resonant frequency.

• Thus,  At a frequency of 995 kHz, the circuit impedance is (d) Capacitive

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