Rectifiers & Filters question from JEE Main 2025 (28 Jan, Shift 2)

Answer: (b)

1. The diode's anode is at the source's lower terminal and its cathode at B, so current flows only when the lower terminal is positive, i.e. when $V < 0$.
2. Then current goes from B to A through $R$, so $V_{AB} = V$ (negative).
3. When $V > 0$ the diode blocks, no current flows, and $V_{AB} = 0$.
4. So $V_{AB}$ shows only the negative half cycles: answer (b).