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(D) In forward bias,the resistance of a $PN$-junction diode is very low,typically $R_{fr} \approx 10 \ \Omega$.In reverse bias,the resistance of a $PN

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$1:10^4$

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(D) In forward bias,the resistance of a $PN$-junction diode is very low,typically $R_{fr} \approx 10 \ \Omega$.In reverse bias,the resistance of a $PN$-junction diode is very high,typically $R_{rev} \approx 10^5 \ \Omega$.The ratio of forward bias resistance to reverse bias resistance is given by $\frac{R_{fr}}{R_{rev}} = \frac{10}{10^5} = \frac{1}{10^4} = 1:10^4$.Therefore,the correct option is $D$.

The approximate ratio of resistances in the forward and reverse bias of the $PN$-junction diode is

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