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Q.

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

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a

0.2 V

b

0.4 V

c

0.6 V

d

0.8 V

answer is B.

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Detailed Solution

Consider   the  case  when  Ge  and  Si  diodes   are connected as shown in the given figure. Equivalent voltage drop across the combination G and Si diode = 0.3 V⇒Current i =12-0.35kΩ=2.34 mA∴Output voltage, Vo=Ri=5 kΩ ×2.34 mA=11.7 V    Now consider the case when Ge diode connection is reversed. In this case voltage drop across the diode's combination = 0.7 V⇒Current i =12-0.75kΩ=2.26 mA∴ Vo-iR=2.26 mA ×5 kΩ=11.3 Vhence, change in the value of Vo=11.7 V-11.3=0.4 V
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