Question

In the given circuit, what is the value of current through R?

(a) 0.7 mA

(b) 0.3 mA

(c) 1 mA

(d) 10 mA

The question was posed to me during an internship interview.

I want to ask this question from Parallel and Series Configuration in portion Diode Circuit of Analog Circuits

Answer 1

The correct answer is (b) 0.3 mA

For explanation: The source voltage initially increases from 0-10 V. As the source voltage increases, the voltage across the diodes also increases. When the voltage across the diodes reaches a value of 0.3 V, the Germanium diode starts conducting, whereas the silicon diode is still in the off state. Hence, the voltage across R = 0.3 V. Hence, current = 0.3 mA.