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Question

# 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
Resistor and inductor
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B
Resistor and capacitor
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C
Resistor, inductor and capacitor
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D
None of these
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Solution

## The correct option is C Resistor, inductor and capacitorImpedance of an LCR ciorcuit is given by Z=√R2+(Xl−XC)2=√R2+(2πυL−12πυC)2The variation of Z with υ is shown in the figure.As υ increases , Z decreases and hence current increases.At υ=υr, Z is minimum , current is maximum . Beyond υ=υr , Z increases and current decreases. Hence , the combination of circuit elements is most likely to comprise the circuit are R, L and C .

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