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A periodic waveform observed across a load is represented by

$V(t)=\begin{cases} 1+sin\omega t & 0\leq \omega t< 6\pi \\ -1+sin\omega t & 6\pi \leq \omega t< 12\pi \end{cases}$

The measured value, using moving iron voltmeter connected across the load, is

- $\sqrt{\frac{3}{2}}$
- $\sqrt{\frac{2}{3}}$
- $\frac{3}{2}$
- $\frac{2}{3}$

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