KCET 2020 Physics Solved Paper

During the positive half cycles of input 𝑎𝑐, a 𝑝 − 𝑛 junction diode is forward biased and hence it ‌‌‌‌‌‌ conducts.}
While during the negative half cycles, the diode will be reverse biased and hence does not conduct.
The capacitor is charged to maximum potential difference.
Therefore, the potential difference across capacitor 𝐶 is equal to the peak value of the applied ac voltage, i.e.,
V=Vmax
or, V=√2Vrms
or, V=√2×220V=200√2V