The frequency of ac mains in India is P (1) \( 30 \mathrm{c} / \mat...

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The frequency of ac mains in India is
P
(1) \( 30 \mathrm{c} / \mathrm{s} \) or \( \mathrm{Hz} \)
W
(2) \( 50 \mathrm{c} / \mathrm{s} \) or \( \mathrm{Hz} \)
(3) \( 60 \mathrm{c} / \mathrm{s} \) or Hz
(4) \( 120 \mathrm{c} / \mathrm{s} \) or \( \mathrm{Hz} \)
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