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Question

Ge and Si diodes conduct at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection is reversed, the value of V0 changes by
1118972_d6e63d376bf941beaad6e371540d2310.png

A
0.2 V
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B
0.4 V
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C
0.6 V
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D
0.8 V
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Solution

The correct option is B 0.4 V
Consider the case when Ge and Si diodes are connected as shown in the figure.
Equivalent voltage drop across the combination Ge and Si diode =0.3 V

Current i=1203kΩ=2.34 mA

Out put voltage V0=Ri=5 kΩ×2.34 mA=11.7 V

Now consider the case when diode connection are reversed. In this case voltage drop across the diodes combination =0.7 V

Current i=120.75 kΩ=2.26 mA

V0=iR=2.26 mA×5 kΩ=11.3 V

Hence charge in the value of V0=11.711.3=0.4 V

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