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Physics-

General

Easy

Question

The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2volt is applied

1 $Ω$
0.25 $Ω$
0.5 $Ω$
5 $Ω$

The correct answer is: 0.25 $capital omega$

The current at 2V is 400 mA and at 2.1 V it is 800 mA. The dynamic resistance in this region $R equals fraction numerator capital delta V over denominator capital delta i end fraction equals fraction numerator left parenthesis 2.1 minus 2 right parenthesis over denominator left parenthesis 800 minus 400 right parenthesis cross times 1 0 to the power of negative 3 end exponent end fraction equals fraction numerator 1 over denominator 4 end fraction equals 0.25 capital omega$

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