Question

A 220 V AC supply is connected between points A and B . What will be the potential difference V across the capacitor ?

A. 200 V
B. 110 V
C. 0 V
D. `220 sqrt(2) V`

Answer 1

Correct Answer - D
Capacitor once gets charged upto maximum potential. After that for any other lesser value of `p.d` across `A` and `B` diode is reverse biased and it does not allow charged to flow in opposite direction.
From `V_(rms)=(V_(max))/(sqrt(2))`
`rArr V_(max)=V_(rms) sqrt(2) =220 sqrt(2)` volts.