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| 1. |
When the temerature increases why resistivity increses???(it is of physics) |
| Answer» When the temperature is increased, the atoms of the material vibrate and it makes the valence electrons present in the valence band to shift to the conduction band. This in turn increases the conductivity of the material. When the conductivity of the material increases, it means that the resistivity decreases and so the current flow increases. Thus some insulators at room temperatures changes to conductors at high temperature. For insulators they have a negative temperature co – efficient. So the value of temperature co –efficient of resistivity, α is\xa0negative.\xa0 | |