The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of its I-V characteristic curve. The voltage across the diode is independent of current above the knee point. If V B = 5 V, then the maximum value of R so that the voltage is above the knee point, will be
Text Solution
Verified by ExpertsThe correct answer is:
A
At knee point voltage across the diode is 0.7V.
Hence voltage across resistance R is 5 – 0.7 = 4.3 V.
⇒ ⇒ using V = iR ⇒ ⇒ 4.3 = 1 × × 10 –3 × × R ⇒ ⇒ R = 4.3 k Ω Ω .
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