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Calculate the time taken by 60 Hz a.c so...

Calculate the time taken by 60 Hz a.c source to reach its negative peak value from zero value ?

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Here, `v = 60 Hz, T = (1)/(v) = (1)/(60) s`
From negative peak value to zero value, time taken
`t = (T)/(4) = (1)/(50 xx 4) s = (1)/(240)` second.
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