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JEE Main201910 Apr 2019Morning ShiftPhysicsCurrent ElectricityActual

In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line. One may conclude that

Options

  1. AR T = R 0 e T 2 / T 0 2
  2. BR T = R 0 T 2
  3. CR T = R 0 e - T 2 / T 0 2
  4. DR T = R 0 e - T 0 2 / T 2

Correct answer

D. R T = R 0 e - T 0 2 / T 2

Step-by-step solution

From the given graph, l n R = - m 1 T 2 + C R = e - m 1 T 2 + C = e - m 1 T 2 e C Further, it can be written as, R = R 0 e - T 0 2 T 2

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