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Q.

Assume that the silicon diode in the circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of I-V characteristics. Also assume that the voltage across the diode is independent of current above the knee point. If VB = 5V, then the maximum value of R so that the voltage is above the knee point is

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a

4.3 kΩ

b

2 kΩ

c

1 kΩ

d

0

answer is A.

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Detailed Solution

R=5−0.7V1×10−3=4.310−3Ω=4.3×103Ω=4.3kΩ
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Assume that the silicon diode in the circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of I-V characteristics. Also assume that the voltage across the diode is independent of current above the knee point. If VB = 5V, then the maximum value of R so that the voltage is above the knee point is