The deviation of I-V graph from the straight line is due to:
Correct answer: B. Increase in temperature and increase in resistance
- A. Decrease in temperature and decrease in resistance
- B. Increase in temperature and increase in resistance
- C. Decrease in temperature and increase in resistance
- D. Increase in temperature and decrease in resistance
Explanation
Explanation:The deviation of an I-V graph from a straight line is due to the fact that the resistance of a material changes with temperature. As the temperature of a material increases, its resistance also increases,. which cause the I-V graph to deviate from a straight line.This option is not correct because a decrease in temperature and resistance would result in a decrease in the deviation of the I-V graph from a straight line. This option is also incorrect because a decrease in temperature and an increase in resistance would result in a smaller deviation of the I-V graph from a straight line. This option is also incorrect because an increase in temperature and a decrease in resistance would result in a smaller deviation of the I-V graph from a straight line.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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