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Question

The change in current through a junction diode is 1.2 mA when forward bias voltage is changed by 0.6 V. The dynamic resistance is

A
500Ω
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B
300Ω
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C
150Ω
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D
250Ω
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Solution

The correct option is A 500Ω
Given - ΔV=0.6V;ΔI=1.2mA=1.2×103A
The dynamic resistance of a junction diode is the ratio of small change in voltage to the small change in current i.e.
rd=ΔVΔI
Hence rd=0.61.2×103=500Ω

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