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Current Electricity
Resistivity and Temperature
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- of Current Electricity
- 0.77%
Concepts tested
- Resistivity depends on material and temperature
All Questions
2002 AIPMT 1 question
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Specific resistance of a conductor increases with :Specific resistance (resistivity) $\rho$ is a property of the material. It does not depend on the geometry (length or area) of the conductor.
For a metallic conductor, resistivity increases with temperature: $\rho_T = \rho_0(1 + \alpha\Delta T)$, because the ions vibrate more and electrons collide more often.
Changing length or area changes the resistance $R = \dfrac{\rho l}{A}$, but not $\rho$.
So the specific resistance of a conductor increases with increase in temperature.