Question

At 0.3 V and 0.7 V, the diodes Ge and Si become conductors respectively. In the given figure, if the ends of diode Ge are overturned, the change in potential V₀ will be ______.

 

Options

• 0.2 V

• 0.6 V

• 0.4 V

• 0.8 V

Answer 1

At 0.3 V and 0.7 V, the diodes Ge and Si become conductors respectively. In the given figure, if the ends of diode Ge are overturned, the change in potential V₀ will be 0.4 V.

Explanation:

Since both Ge and Si are initially forward-biased, the Ge diode may successfully conduct current with a 0.3 V voltage drop.

∴ Initial output voltage, V₀ = 12 - 0.3 = 11.7 V

Only the Si diode will function when the ends of the Ge diode are reversed, or when it is in reverse bias. When this is the case, the output voltage,

V₀ = 12 - 0.7 = 11.3 V

 

∴ Change in output voltage = 11.7 - 11.3 = 0.4 V