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The i-V characteristic of a p-n junction...

The i-V characteristic of a p-n junction diode is shown in figure.Find the approximate dynamic resistance of the p-n junction when (a) a forward bias of 1 volt is applied ,(b) a forward bias of 2 volt is applied is applied .

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(a) The current at 1 volt is 10 mA and at 1.2volt it is 15mA.The dynamic resistance in this region is
`R=(DeltaV)/(Delta i)=0.2volt /5mA=40(Omega)`
(b) the current at 2 volt is 400 mA and at 2.1volt it is 800mA.The dynamic resistance in this region is
`R=(Delta V)/(Delta I)=0.1 volt/400mA=0.25(Omega).`
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