Correct option is D
· In India, the standard frequency of the alternating current (AC) power line voltage is 50 Hz. This means the current changes direction 50 times per second. This standard is consistent across many countries in Europe, Asia, Africa, and Australia.
· In contrast, countries like the United States and Canada use a standard frequency of 60 Hz.
· Therefore, the frequency of the AC power line voltage in India is
50 Hz.
