Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 37

37. A d.c. battery of V volt is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be

[2002]

(a) 2V when diode is forward biased

(b) Zero when diode is forward biased

(c) V when diode is reverse biased

(d) V when diode is forward biased

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Answer:

Correct Answer: 37. (d)

Solution:

  1. (d) In forward biasing, the diode conducts. For ideal junction diode, the forward resistance is zero; therefore, entire applied voltage occurs across external resistance R i.e., there occurs no potential drop, so potential across R is V in forward biased.

(b) For conduction, pn junction must be forward biased. For conduction p-side should be connected to higher potential and n-side to lower potential.



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