Refer to the circuit diagram given in the figure. which of the… | JEE Main 2025 (23 Jan, Shift 1)

Q34JEE Main 2025 · 23 JAN · SHIFT 1Medium

P-N Junction Diode

Refer to the circuit diagram given in the figure. which of the following observations are correct? A. Total resistance of circuit is $6\ \Omega$

B. Current in Ammeter is 1 A

C. Potential across $AB$ is 4 Volts.

D. Potential across CD is 4 Volts

E. Total resistance of the circuit is $8\ \Omega$ .

Choose the correct answer from the options given below:

Show answer and solution

Answer: (d)

The diode points from D to A, so it is forward biased (short). Between D and B: $4\ \Omega \parallel 4\ \Omega = 2\ \Omega$ .
Total resistance $= 4 + 2 = 6\ \Omega$ , so A is correct and E is wrong.
Ammeter current $= \dfrac{6}{6} = 1$ A, so B is correct.
$V_{CD} = 1\times 4 = 4$ V (D correct); $V_{AB} = 0.5\times 4 = 2$ V (C wrong).
So the answer is (d) A, B and D only.

P-N Junction Diode question from JEE Main 2025 (23 Jan, Shift 1)