Question

# The frequency of AC mains in India is(A) $110C{s^{ - 1}}$ (B) $50C{s^{ - 1}}$(C) $60C{s^{ - 1}}$ (D) $120C{s^{ - 1}}$

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Hint: Frequency of AC or alternating current is defined as the number of cycles current completes per second. The frequency of AC which reaches our home is called the main frequency.

We know that the frequency is the measure of the total number of sinusoidal cycles completed in one second. Hence we can say the current changes its direction twice during a complete cycle. It means that in the second alternating current changes its direction twice the no of frequency.
European countries use 50Hz as the AC mains. India also uses the 50Hz as their AC main frequency.
We already know that, alternating current changes its direction twice the times of frequency
So, this is the actual AC that is reaching us is equal to the twice the time of frequency AC main which is 100MHz and we use it for all our electrical needs.
India and most European countries use the electricity which has the frequency of AC mains as 50Hz.
The frequency Of A.C. mains in India is equal to ${\text{50C/s}}$
Hence, option (B) is the correct option.