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Current Electricity — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
MCQ
Which of the following relation is significant for metals when the temperature increases?
  • ✓
    Resistivity increases and conductivity decreases.
  • B
    Resistivity decreases and conductivity decreases.
  • C
    Resistivity and conductivity do not change with temperature.
  • D
    Temperature dependence is non-linear.
✓

Answer

Correct option: A.
Resistivity increases and conductivity decreases.

The resistivity of a metal increases and the conductivity decreases with the increase in temperature. With an increase in temperature, the free electrons collide more frequently with the metal ions. The mean collision time also decreases.

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