The resistivity of a metallic conductor ______________ with decrease in temperature

The resistivity of a metallic conductor decreases with a decrease in temperature.

Here's why:

1. Resistivity is a property of a material that quantifies how strongly it resists the flow of electric current.

2. For most metals, resistivity increases with temperature. This is because, as temperature increases, the atoms of the metal vibrate more vigorously. This increased vibration can cause more frequent collisions with the electrons that are trying to move through the metal, which increases the resistance to their flow.

3. Therefore, if the temperature decreases, the atoms vibrate less. This results in fewer collisions with the electrons, which in turn decreases the resistance to their flow.

4. Hence, the resistivity of a metallic conductor decreases with a decrease in temperature.