Question

frequency of an alternating current if it's direction changes after every 0.01 second​

Answer 1

100Hz is the frequency in 0.01sec.
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Answer 2

The time period of the current = (2x0.01) = 0.02 s

[ Time period is the time required to complete one cycle. After half rotation the current reverses its direction. So in full one rotation, the current flows in the original direction completing one cycle.]

Frequency = 1/ time period = 50 Hz.

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