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(B) For a $PN$ junction diode,the forward current increases with an increase in temperature for a fixed forward voltage. As the temperature increases,

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$T_1 < T_2 < T_3$

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(B) For a $PN$ junction diode,the forward current increases with an increase in temperature for a fixed forward voltage. As the temperature increases,the number of charge carriers increases,leading to a higher current for the same applied voltage. From the given graph,for a fixed voltage $V_B$,the current $I_p$ is highest for $T_3$ and lowest for $T_1$. Therefore,the relationship between the temperatures is $T_1 < T_2 < T_3$.

The characteristic graph of a diode at different temperatures is shown. What is the relationship between the temperatures?

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