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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 are reversed, the valve of V0 changes by

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 show in the given figure.
Equivalent voltage drop across the combination Ge and Si diode = 0.3 V
Current i = 120.35 kΩ = 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 diode's 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 = 11.7 - 11.3 = 0.4 V


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