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  • As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit? A. Inductor and capacitor.

As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?
A. Inductor and capacitor.
B. Resistor and inductor.
C. Resistor and capacitor.
D. Resistor, inductor and capacitor.

Answers (1)

For I to be maximum in a circuit, the reactance should be minimum.  In the LCR circuit, if the frequency is increased, the inductance will increase while the capacitance decreases.

Z=\sqrt{R^2+\left ( X_L-X_C \right )^2}=\sqrt{R^2+\left ( 2\pi \nu L-\frac{1}{2\pi \nu C} \right )^2}

On increasing v, there will come a stage where we will reach resonance

\left ( X_L=X_C \right )

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infoexpert21

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