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(a) ID=15 mA and

(b) VD=−10 V.

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Solution

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Resistance of diode is given vy △V△I

So, at IV=15mA

From V−Icharacteristic equation:

R=(0.8−0.7)V(20−10)mA=10Ω

And,at Vn=−10V

△I=0

So, R is infinite.

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