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QPages 419-421: Q24: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 419-421: Q24 Solution: Each of the resistance shown in figure has a value of . Find…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the circuit is a balanced Wheatstone bridge and ignore the unidirectional nature of diodes, leading to incorrect parallel/series reductions. You must analyze the forward and reverse bias states of each diode for both potential polarities to determine if the symmetry actually holds or if the equivalent resistance changes.

Each of the resistance shown in figure has a value of 20 Ω20 \ \Omega. Find the equivalent resistance between A and B. Does it depend on whether the point A or B is at higher potential?

Step-by-Step Verified Solution

**Answer:** Equivalent resistance = 20 �. **Step-by-Step Explanation:** Each resistance = 20 �. The circuit is a balanced bridge of diodes and resistors. By symmetry, the equivalent resistance between A and B is 20 �. It does not depend on which point is at higher potential because the circuit is symmetric .

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