Question

What do u understand by the resistivity of a substance?

Answer 1

Explanation:

RESISTIVITY OF SUBSTANCE:

It is also know SPECIFIC RESISTANCE:

Specific resistance of a material is the resistance of a wire of that material of unit length and unit area of cross section.

EXPERIMENTALY OBSERVED THAT:

i). the resistance of wire is directly proportional to its length .

R IS DIRECTLY PROPERTIONAL TO " L".

ii). The resistance of wire varies inversely as the area of cross section of wire.

UNIT OF RESISTIVITY: (Om meter.)

NOTE :

The specific resistance of material of a conductor is constant at a given temperature

And it does not depend on the shape and size of conductor .

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