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In the circuit shown below voltage Vin is -3V and VB is -2V. The resistor R is 1K. Cut-in voltage of diode is 0.7V. Forward bias resistance is 10Ω. The voltage V is __________

In the circuit shown below voltage Vin is -3V and VB is -2V. The resistor R is 1K. Cut-in voltage of diode is 0.7V. Forward bias resistance is 10Ω. The voltage V is __________ Correct Answer -4.25V

Effective voltage across diode is one volt. Hence diode is in forward bias mode. So we can apply equivalent circuit of diode. Net voltage through R and RD is -3-2+0.7 = -4.3V Current through the circuit is -4.3/(R+RD) = -4.3/(1010) = -0.00425A=-4.25 mA Hence voltage across R is 1Kx(-4.25mA) = -4.25V.

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