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JEE Main 2019 (9 Jan, Shift 2) · P-N Junction Diode

P-N Junction Diode question from JEE Main 2019 (9 Jan, Shift 2)

Q90JEE Main 2019 · 9 JAN · SHIFT 2Difficult

P-N Junction Diode

Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of V0 changes by: (assume that the Ge diode has large breakdown voltage)

Figure

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Answer: (d)

  1. Both diodes are forward biased and in parallel; the Ge diode turns on first at 0.30.3 V and fixes the drop.
  2. So V0=12−0.3=11.7V_0 = 12 - 0.3 = 11.7 V.
  3. With Ge reversed, it blocks and only Si conducts: V0=12−0.7=11.3V_0 = 12 - 0.7 = 11.3 V.
  4. Change =11.7−11.3=0.4= 11.7 - 11.3 = 0.4 V. So the answer is (d).
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