An ac voltage is represented by E=2202cos50πt. How many times will the current become zero in 1 s?

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50 times

100 times

30 times

25 times

answer is A.

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Detailed Solution

E=E0 cosωt∴ ω=50π2πf=50π⇒f=25 HzIn one cycle ac current becomes zero twice.Therefore, 50 times the current becomes zero in 1 s.

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