If the maximum value of a sine wave AC voltage is 10 V, then its RMS value is-

Correct option is D

​$$\text{The RMS (Root Mean Square) value of a sinusoidal AC voltage is given by the formula:} \\V_{RMS} = \frac{V_{max}}{\sqrt{2}} \\\text{Where } V_{max} \text{ is the maximum value (peak value) of the voltage. Given } V_{max} = 10 V, \\V_{RMS} = \frac{10 V}{\sqrt{2}} = \frac{10 V}{1.414} \approx 7.070 V \\\text{Thus, the RMS value of the given AC voltage is approximately } 7.070 V.$$​​