Logo
Jeeify
MCQEasyJEE 2025Diodes & Rectifiers

JEE Physics 2025 Question with Solution

In the circuit shown, assuming the threshold voltage of the diode is negligibly small, then the voltage VABV_{AB} is correctly represented by:

Circuit diagram with an AC source on the left, a diode in the lower branch, resistor R in the right vertical branch, and output terminals A at top right and B at bottom right.Four waveform options for $$V_{AB}$$ versus time: positive half-wave pulses, sinusoidal AC wave, zero at all times, and negative half-wave pulses.
  • A

    positive half-wave rectified signal

  • B

    Full-wave rectified signal

  • C

    VABV_{AB} would be zero at all times

  • D

    negative half-wave rectified signal

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: The diode threshold voltage is negligibly small and the input is an AC signal. Find: The correct waveform of VABV_{AB}.

From the solution:

  • The circuit contains a diode and a resistor.
  • The input voltage is V0sin⁡ωtV_0 \sin \omega t.
  • the solution concludes that the output waveform is a full-wave rectified signal.

Therefore, the correct option is B.

Note: The source solution explicitly states full-wave rectified signal, so the answer is taken from the solution as required.

Using the extracted solution statement

Given: A diode-resistor circuit with negligible diode threshold. Find: Which shown waveform matches VABV_{AB}.

The extracted solution says:

Vinput=V0sin⁡ωtV_{\text{input}} = V_0 \sin \omega t

and then states that due to the nature of the diode, the output waveform is a full-wave rectified signal.

It further summarizes the output as: only positive half-cycles remain.

Hence, according to the provided the solution, the waveform corresponds to Option B.

Common mistakes

  • Assuming the diode allows both half-cycles to appear unchanged at the output. This is wrong because a diode conducts asymmetrically. Always check diode conduction separately in positive and negative half cycles.

  • Judging the answer only from the circuit sketch and ignoring the provided solution conclusion. Here, the extraction rule requires the solution to be the primary source for the final answer.

Practice more Diodes & Rectifiers questions

Get unlimited AI-adaptive practice, mastery tracking, and an AI tutor that explains every step — free to start.

Start free trialMore on Diodes & Rectifiers

Related questions