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In the circuit shown in below I = 2mA, VB = 2V and R = 2K. The voltage V will be ____________

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In the circuit shown in below I = 2mA, VB = 2V and R = 2K. The voltage V will be ____________

(a) 2V

(b) 3V

(c) 6V

(d) 5V

This question was addressed to me in an internship interview.

The doubt is from Ideal Diode Model topic in chapter Diode Circuit of Analog Circuits

1 Answer

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Best answer
Right option is (a) 2V

For explanation: In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero.

Consider that diode is reverse biased. But, that does not satisfy KCL at the node. No incoming current is present. Hence diode is forward biased and short-circuited. Hence the output voltage = V = VB = 2V.

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