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(C) The forward bias characteristic of a $PN$ junction diode is non-linear and exponential in nature.As the forward voltage $V$ increases,the current

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$D$

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(C) The forward bias characteristic of a $PN$ junction diode is non-linear and exponential in nature.As the forward voltage $V$ increases,the current $I$ increases slowly at first and then rises rapidly after the knee voltage.Among the given curves,curve $D$ shows an exponential increase in current with voltage,which is characteristic of the forward bias region of a diode.Curve $A$ represents a linear decrease,$B$ represents a slow linear increase,and $C$ represents a linear increase.Therefore,graph $D$ correctly represents the forward bias characteristic.

Which one of the following graphs represents the forward bias characteristic of a diode?

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