alleryAC (Alternating Current) reverses its direction every:
A1 second
B1/50 second (in India: 50 Hz)
C1/60 second (in India)
D10 milliseconds
Answer & Solution
Correct answer: D. 10 milliseconds
1. India's mains AC frequency is 50 Hz.
2. Period T = 1/50 = 20 ms = 0.020 s for one full cycle.
3. AC reverses direction every HALF cycle = T/2 = 10 ms.
4. So 100 reversals per second in India (60 Hz in the USA = 120/s).
_Source: syllabus Science Ch 12 §12.7 AC vs DC_
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