An ac voltage is represented by E=220√2cos(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=E0cosωt ∴ω=50π 2πf=50π⇒f=25Hz In one cycle ac current becomes zero twice. Therefore, 50 times the current becomes zero in 1 s