(A) For a metal like $Cu$,the resistance $R$ increases linearly with temperature $T$ in a limited range,given by $R = R_0(1 + \alpha \Delta T)$,where

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Linear increase for $Cu$,exponential decrease of $Si$

(A) For a metal like $Cu$,the resistance $R$ increases linearly with temperature $T$ in a limited range,given by $R = R_0(1 + \alpha \Delta T)$,where $\alpha$ is the temperature coefficient of resistance.For an intrinsic (undoped) semiconductor like $Si$,the number of charge carriers increases exponentially with temperature,leading to an exponential decrease in resistance,given by $\rho = \rho_0 e^{E_g / k_B T}$,where $E_g$ is the band gap energy and $k_B$ is the Boltzmann constant.

Class 12 Physics Current Electricity Mix Examples-Current Electricity

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The temperature dependence of resistances of $Cu$ and undoped $Si$ in the temperature range $300-400 \ K$,is best described by

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Linear increase for $Cu$,exponential decrease of $Si$
B
Linear decrease for $Cu$,linear decrease for $Si$
C
Linear increase for $Cu$,linear increase for $Si$
D
Linear increase for $Cu$,exponential increase for $Si$

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The temperature dependence of resistances of $Cu$ and undoped $Si$ in the temperature range $300-400 \ K$,is best described by

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The ends of an element of zinc wire are kept at a small temperature difference $\Delta T$ and a small current $I$ is passed through the wire. Then, the heat developed per unit time

The figure shows a network of four resistances and three batteries. The electrical power dissipated as heat in the circuit is .............. $W$.

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