1.

In an A.C. circuit in 1 second current reduces to zero value 120 times. Hence the frequency of A.C. current is ...... Hz.

Answer»

50
100
60
120

Solution :In a one frequency, the value of CURRENT BECOMES TWO times zero.
In 1s if the value of current becomes 120 times zero then its frequency would be f = 60HZ.


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