Temperature dependence of resistivity $\mathrm{}$$$\rho(T)$$ of semiconductors, insulators, and metals is significantly based on the following factors:

 (a) number of charge carriers can change with temperature $$T$$. (b) the time interval between two successive collisions can depend on $$T$$. (c) length of material can be a function of $$T$$. (d) mass of carriers is a function of $$T$$.

Which of the above statements is correct?

 1 (a, b) 2 (c, d) 3 (b, c) 4 (b, d)
Subtopic: Â Derivation of Ohm's Law |
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A metal rod of length 10 cm and a rectangular cross-section of  $$1~ \text {cm} \times 1/2~ \text {cm}$$ is connected to a battery across opposite faces. The resistance will be:

 1 maximum when the battery is connected across$$1~ \text {cm} \times 1/2~ \text {cm}$$ faces. 2 maximum when the battery is connected across $$10~ \text {cm} \times 1~ \text {cm}$$ faces. 3 maximum when the battery is connected across $$10~ \text {cm} \times 1/2~ \text {cm}$$ faces. 4 same irrespective of the three faces.

Subtopic: Â Derivation of Ohm's Law |
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