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NEET-XII-Physics

14: Semiconductor Electronics: Materials Devices and Simple Circuits

Qstn# 14-a Prvs-QstnNext-Qstn
  • #14-a
    What will be the forward current at a forward voltage of 0.6 V?
    (b) What will be the increase in the current if the voltage across the diode is increased to 0.7 V?
    (c) What is the dynamic resistance?
    (d) What will be the current if reverse bias voltage changes from 1 V to 2 V?
    Ans : Forward voltage, V = 0.6 V

    ∴Current, I



    Therefore, the forward current is about 0.0256 A.
    (b) For forward voltage, V’ = 0.7 V, we can write:





    Hence, the increase in current, ΔI = I‘ - I

    = 1.257 - 0.0256 = 1.23 A
    (c) Dynamic resistance


    (d) If the reverse bias voltage changes from 1 V to 2 V, then the current (I) will almost remain equal to I0 in both cases. Therefore, the dynamic resistance in the reverse bias will be infinite.
  • #14-b
    What will be the increase in the current if the voltage across the diode is increased to 0.7 V?
    Ans : For forward voltage, V’ = 0.7 V, we can write:





    Hence, the increase in current, ΔI = I‘ - I

    = 1.257 - 0.0256 = 1.23 A
  • #14-c
    What is the dynamic resistance?
    Ans : Dynamic resistance


  • #14-d
    What will be the current if reverse bias voltage changes from 1 V to 2 V?
    Ans : If the reverse bias voltage changes from 1 V to 2 V, then the current (I) will almost remain equal to I0 in both cases. Therefore, the dynamic resistance in the reverse bias will be infinite.