Question

the electrical resistivity is maximum for - (a) copper (b) ebonite (c) silicon (d) iron

Answer 1

the electrical restivity is maximum in copper as it is a good conductor of electricity.

Answer 2

Answer: The electrical resistivity is maximum for ebonite.

Explanation:

The resistivity is the property of the material.

Formula of the resistivity is

$\rho = \dfrac{RA}{l}$

Where, $\rho$ = resistivity of the material

R = resistance

l = length

A = cross section area

The electrical resistivity is

Copper = $1.68\times10^{-8} \Omega\ m$

Ebonite =  $1-100\times10^{13} \Omega\ m$

Silicon = $1.59\times10^{-8} \Omega\ m$

Iron = $9.71\times10^{-8} \Omega\ m$

According to resistivity , copper, iron is a metal and a good conductor, silicon is a semiconductor but ebonite is a insulator.

Hence, The electrical resistivity is maximum for ebonite.