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Assume that the silicon diode in the cir...

Assume that the silicon diode in the circui shown in fig. requires a minimum current of `1mA` to be above the knee point `(0.7V)` of its `I-V` characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point.
(a) If `V_(B)=5V`, what should be the maximum value of `R` so that the voltage is above the knee point?
(b) If `V_(B)=5V`, what should be the value of `R` to estabilish the current of `5mA` in the circuit?
(c) What is the power dissipated in the resistance `R` and in the diode, when a current of `5mA` flows in the circuit at `V_(B)=6V`?
(d) If `R=1kOmega`, what is the minimum voltage `V_(B)` required to keep the diode above the knee point?

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