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# The V-I characteristic of a silicon diode is shown in the figure. Calculate the resistance of the diode at (a) ID=15 mA and (b) VD=−10 V.

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#### We know that,Resistance of diode is given vy △V△ISo, at IV=15mAFrom V−Icharacteristic equation:R=(0.8−0.7)V(20−10)mA=10ΩAnd,at Vn=−10V△I=0So, R is infinite.

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