The frequency of AC mains in India is

Options

A. 100 Hz
B. 50 Hz
C. 1/100 Hz
D. 1/50 Hz

Explanation

### Step-by-Step Solution:

1. **Understanding AC Mains Frequency**: The frequency of the alternating current (AC) mains refers to how many cycles of current flow occur in one second. In India, this frequency is standardized.

2. **Identifying the Frequency**: The frequency of AC mains in India is 50 Hz. This means that the alternating current completes 50 cycles in one second.

3. **Calculating the Time Period**: The time period (T) is the duration of one complete cycle of the AC waveform. It can be calculated using the formula:
\[ T = \frac{1}{f} \]
where \( f \) is the frequency in hertz (Hz). For a frequency of 50 Hz:
\[ T = \frac{1}{50} \text{ seconds} = 0.02 \text{ seconds} \]

4. **Conclusion**: Therefore, the frequency of AC mains in India is 50 Hz, and the corresponding time period is 0.02 seconds.