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Ge and Si diodes conduct at 0.3 V and 0....

`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 value of `V_(0)` changes by

A

0.2 V

B

0.4 V

C

0.6 V

D

0.8 V

Text Solution

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The correct Answer is:
B
When diodes are as shown ini figure
`i=(12-0.3)/(5KOmega)=2.34mA`
`therefore` output voltage `V_(@)=iR=2.34Maxx5kOmega=11.7V`
now when Ge diode is reverse bias voltage drop across diode's combination=0.7 V
`i=(12-0.7)/(5KOmega)=2.26mA`
`V_(@)=iR=2.26mAxx5kOmega=11.3V`
change in value of `V_(@)=11.7-11.3=0.4V`
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