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Question

An ac voltage is represented by E=2202 cos(50π)t. The current becomes zero times in 1 sec.

A
25
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B
50
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C
75
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D
100
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Solution

The correct option is B 50
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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