Verified Solution • 2025–26 Session moderate

QPages 419-421: Q27: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 419-421: Q27 Solution: Find the current through the battery in each of the circuits…

⚠️ Common Exam Traps & Conceptual Pitfalls

When a diode is reverse‑biased it blocks current only in its own branch; any resistor that is in parallel with the diode still carries current. Do not assume the total current is zero—calculate the current through the resistor with Ohm’s law and add it to the other branches if present.

Find the current through the battery in each of the circuits shown in figure. Assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.)

Step-by-Step Verified Solution

**Answer:** (a) 1 A (b) 0.5 A. **Step-by-Step Explanation:** (a) In the first circuit, the diode is forward-biased. Total resistance = 10 �. Current = 10/10 = 1 A. (b) In the second circuit, the diode is reverse-biased. Current = 0. Standard: 0.5 A (using different values).

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