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In the circuit shown below current I is 2mA and VB is -1V. The resistor R is 1K. Cut-in voltage of diode is 0.7V. Forward bias resistance is 10Ω. The voltage V is __________

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In the circuit shown below current I is 2mA and VB is -1V. The resistor R is 1K. Cut-in voltage of diode is 0.7V. Forward bias resistance is 10Ω. The voltage V is __________

(a) 1.3V

(b) 0.3V

(c) 1V

(d) 2V

I had been asked this question by my school principal while I was bunking the class.

I need to ask this question from Piecewise Linear Model of Diode-2 topic in chapter Diode Circuit of Analog Circuits

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Correct choice is (c) 1V

For explanation I would say: Since current source is reverse bias to the diode current passes through resistor R. Voltage across resistor R is 2mA x 1k = 2V. Since resistor and diodes are parallel net output voltage V is VB + voltage across resistor R = -1+2 = 1V.

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