Ge and Si diodes start conducting at 0.3 V and 0.7 V, respectively. In the shown circuit, if the Ge-diode connection is reversed, by how much does V₀ change? Assume a large Ge breakdown voltage. Image
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Question

Ge and Si diodes start conducting at 0.3 V and 0.7 V, respectively. In the shown circuit, if the Ge-diode connection is reversed, by how much does V₀ change? Assume a large Ge breakdown voltage. Image

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G1 Physics · Accepted Answer

Use 0.3 V for the Ge forward drop and 0.7 V for the Si forward drop. Reversing the Ge diode changes which branch conducts; solving the node voltage before and after reversal gives a change of 0.4 V. Correct answer: C.