Question

What is electrical resistivity of amaterial? What is it's unit? Describe an experiment to study the factors on which this. Resistance of conductor wire depends

Answer 1

R= rho×L/A or rho = R×A/L

R= resistance

therefore Resistance of a conductor depends on :

1. rho = specific resistance or Resistivity

(Nature of the material and temperature)

Also The resistance is directly proportional to Resistivity.

If the material have more Resistivity then it has less current.

On increasing the temperature the resistance increases.

2. L = length of conductor

3. A = area of cross-section

The unit of Resistivity or Electrical Resistivity is ohm-metre