Question

Describe an experiment to study the factors on which the resistance of a conducting wire depends. What is meant by electrical resistivity of a material? Derive its SI unit.

Answer 1

Answer:

electrical resistivity is the number of successive resistance had been taken place in an electrical  wire.

Experiment:-

Take 2 copper isolated wires and make them an electromagnet by making  n number of turns of that copper wires around the coil.

• Increase the length of the wire.

         L ∝ R

• Increase the area of that coil which is covered with the copper.

        $\frac{1}{A}$  ∝ R

• Increase the temperature of the electromagnet.                                                                    L ∝ R