Ncert Exercises & Solutions

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

1. $220 V$

2. $110 V$

3. $0 V$

4. $220 \sqrt{2} V$

(d) Hint: The p-n junction is forward biased for half-cycle.

Step 1: Find the potential difference across the capacitor.

As the p-n junction conducts during the positive half-cycle only, the diode-connected here will work in the positive half-cycle. The potential difference across C = peak voltage of the given AC voltage

= V_{0} = V_{rms} \sqrt{2} = 220 \sqrt{2} V .

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