In case of AC circuits the relation $V = i Z,$ where Z is impedance, can directly be applied to:

peak values of voltage and current only

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rms values of voltage and current only

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instantaneous values of voltage and current only

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Both 1 and 2 are true

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Solution

The correct options are
A peak values of voltage and current only
D Both 1 and 2 are true
The relationship holds for instantaneous values of voltage and current. Hence, it also applies for rms values of voltage and current.
This does not apply for peak values of voltages and current because when voltage is maximum (magnitude), current is minimum (magnitude).

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