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JEE Main 2021 (25 Feb, Shift 1) · P-N Junction Diode

P-N Junction Diode question from JEE Main 2021 (25 Feb, Shift 1)

Q76JEE Main 2021 · 25 FEB · SHIFT 1Medium

P-N Junction Diode

A 5V battery is connected across the points X and Y. Assume D1 and D2 to be normal silicon diodes. Find the current supplied by the battery if the +ve terminal of the battery is connected to point X.

Figure

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Answer: (c)

  1. With X positive, current flows up the left side and left to right through the branches.
  2. D1D_1 points right: forward biased (Si drop ≈0.7\approx 0.7 V), 10 Ω10\ \Omega branch conducts. D2D_2 points left: reverse biased, no current.
  3. I=5−0.710=0.43I = \dfrac{5 - 0.7}{10} = 0.43 A
  4. So the answer is (c) ∼0.43\sim 0.43 A.
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