The I-V characteristics of \( a p-n \) junction diode in forward bias is shown in the figure. Th...

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The I-V characteristics of \( a p-n \) junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltage of \( 2 \mathrm{~V} \) and \( 4 \mathrm{~V} \) respectively, is
(a) \( 1: 2 \)
(b) \( 5: 1 \)
(c) \( 1: 40 \)
(d) \( 20: 1 \)
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