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MHT CET202525 Apr 2025Morning ShiftPhysicsSemiconductorsActual

In which of the following figures, the p. n. junction diode is reverse biased?

Options

  1. A(c)
  2. B(d)
  3. C(b)
  4. D(a)

Correct answer

C. (b)

Step-by-step solution

A p - n junction diode is reverse biased when the potential at its p -side (anode) is lower than that at its n -side (cathode), i.e., V_p Figure (a) : With V_p = +6 V and V_n = -2 V , V_p > V_n , so the diode is forward biased. Figure (b) : With V_p = -5 V and V_n = +3 V , V_p Figure (c) : With V_p = 0 V and V_n = -10 V , V_p > V_n , so the diode is forward biased. Figure (d) : With V_p = +6 V and V_n = 0 V , V_p > V_n , so the diode is forward biased. Only the diode in figure (b) is reverse biased.

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