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If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value?

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If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value?

(a) i=Im/2

(b) i=Imsinθ

(c) i=Imcosθ

(d) i=Imsinθ or i=Imcosθ

This question was posed to me during an interview.

This intriguing question comes from Average and RMS Values of Sinusoidal & Non-Sinusoidal Currents and Voltages in section Alternating Voltage and Current of Basic Electrical Engineering

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Right choice is (d) i=Imsinθ or i=Imcosθ

Explanation: The instantaneous value of a sinusoidal varying current is i=Imsinθ or i=Imcosθ where Im is the maximum value of current.

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