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Question

An ac voltage is represented by E=2202 cos(50π)t How many times will the current becomes zero in 1 s?


A

50 times

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B

100 times

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C

30 times

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D

25 times

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Solution

The correct option is A

50 times


E=E0 cos ωt
ω=50π
2πf=50πf=25 Hz
In one cycle ac current becomes zero twice.
Therefore, 50 times the current becomes zero in 1 s


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