A single-phase full-wave AC phase controller feeds power to a resistive load of 100 Ω from a 220 V, 50 Hz supply. What will be the R.M.S. output voltage at delay angles $$\alpha_{1}=\alpha_{2}=\alpha=\frac{\pi}{2}$$ of both transistors?

A

$$\frac{220}{\sqrt{2}}$$ V

B

$$\sqrt{2 \times 220}$$ V

C

$$\sqrt{2} \times 110 V $$

D

$$\sqrt{2} \times 220 V $$