Question

What two things affect the resistance of a wire?

Answer 1

LENGTH AND AREA OF CROSS SECTION

Explanation:

The two things affect the resistance are length of the wire and the area of cross section of the wire .

If we increase the length of the wire the resistance increases .
`R alpha l`

If we increase the area of cross section of the wire resistance decreases.
`Ralpha1/A`

combining the above two equations we get `Ralphal/A`

So that `R=(k*l)/A` where k proportionality constant which is called as resistivity ( `rho` ) which depends on the nature of the material of the wire.

So we can summarize the equation as `R=(rho*l)/A`

Hence resistance of the wire is affect by the length of the wire and the area of cross section of the wire