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Question

An AC supply with constant peak voltage and variable frequency is applied across a capacitor of capacitance C. Which of the following graphs correctly depicts the variation of peak current (i) with angular frequency (ω)?

A
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B
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C
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D
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Solution

The correct option is B
We know that, for a purely capacitive AC circuit, peak current,

i=V0XC=V01/ωC=V0Cω

This equation is similar to the equation of a straight line passing through origin, y=mx.

Therefore, the curve between peak current and angular frequency will be a straight line passing through the origin.


Hence, option (B) is the correct answer.

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