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If the forward voltage in a semiconductor diode is changed from 0.5V to 0.7 V, then the forward current changes by 1.0 mA. The forward resistance of diode junction will be

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Forward resistance `=(DeltaV)/(DeltaI)`
`therefore" "(DeltaV)/(DeltaI)=(0.7-0.5)/(1.0xx10^(-3))=200Omega`.
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