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QPages 419-421: Q29: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 419-421: Q29 Solution: Draw the current-voltage characteristics for the device show in …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently assume the diode conducts in the reverse polarity and draw a negative‑slope branch, but with the ideal diode model reverse bias means infinite resistance, so the current is exactly zero for $V_{AB}<0$. Remember that only the forward‑biased diode becomes a short (zero resistance) while the reverse‑biased one is an open circuit.

Draw the current-voltage characteristics for the device show in figure between the terminals A and B. Assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.)

Step-by-Step Verified Solution

**Answer:** Current-voltage characteristic is piecewise linear. **Step-by-Step Explanation:** For V_AB > 0 (A positive), the diode conducts and the device acts as a short circuit (zero resistance). For V_AB < 0, the diode is reverse-biased and the device acts as an open circuit (infinite resistance). The I-V graph shows a vertical line at V = 0 for I > 0 and I = 0 for V < 0 .

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