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In the circuit below VB = 2V, Vin = 5V. The voltage V across resistor R in ideal diode is __________

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In the circuit below VB = 2V, Vin = 5V. The voltage V across resistor R in ideal diode is __________

(a) 5V

(b) 2V

(c) 3V

(d) 0V

I had been asked this question in an internship interview.

I would like to ask this question from Ideal Diode Model topic in chapter Diode Circuit of Analog Circuits

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Correct answer is (d) 0V

Easy 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.

Since the diode is in reverse bias, no current flows through it and thus through the resistor too. Thus voltage across resistor is zero.

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