Different alternating voltages are given below. In which case the p...

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Different alternating voltages are given below. In which case the peak value and rms value are same?
(I)
(II)
(III)
(IV)
(1) (III) only
(2) (IV) only
(3) (I), (II) \& (III)
(4) (II) \& (III)
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