Factors on Which the Resistance of a Conductor Depends

The resistivity (ohm-metre) of four materials A, B, C and D are $6.84\times {10}^{-8}$, $1.62\times {10}^{-8}$, $5.20\times {10}^{-8}$ and $2.63\times {10}^{-8}$ respectively. Which of these materials has very high electric conductivity?

What is meant by electrical conductivity?

The electrical resistivity and electrical conductivity of a material is the same.

Explain the relation between electrical resistivity and conductivity?

A material $\mathrm{B}$ has twice the specific resistance of the material $\mathrm{A}$. A circular wire made of $\mathrm{B}$ has twice the diameter of the wire made of $\mathrm{A}$. Then, for the two wires to have to have the same resistance, the ratio $\frac{{\mathrm{L}}_{\mathrm{a}}}{{\mathrm{L}}_{\mathrm{b}}}$ of their respective lengths must be 

_____ of a substance is the resistance of the conductor of unit length and unit area of cross-section.

The resistance of a conductor of unit length and unit area of cross-section when current flows perpendicular to its faces is known as specific gravity.

Which among the following represents the graph between area of cross-section $\left(a\right)$ and resistance $\left(R\right)$ of different conducting wires which are made by same material having equal length. 

The resistance of a wire of length $10 \mathrm{m}$ is $2 \mathrm{\Omega }$. If the area of cross-section of the wire is $2\times {10}^{-7} {\mathrm{m}}^2$, calculate its electrical conductivity.

A cylindrical tube of length $l$ has inner and outer radii $a$ and $b$. The resistivity of the material is $\rho$ then calculate the resistance between the two end of the cylindrical tube.

A negligibly small current passes through a wire of length $15 \mathrm{m}$ and uniform cross-section $6.0\times {10}^{-7} {\mathrm{m}}^2$ and its resistance is measured to be $5.0 \mathrm{\Omega }$. What is the resistivity of the material at the temperature of the experiment?

Two resistances are of same material and are having same length. If the ratio of their cross-sectional area is $2:11$ then what will be the ratio of their resistances?

Define resistivity.

How resistance depends upon cross section area?

What is the unit of specific resistance or resistivity?

Resistivity depends on which of the following?

Electrical resistivity of a given metallic wire depends upon:

Two wires of same metal have the same length but their cross-sectional area in the ratio $3:1$. They are joined in series. The resistance of the thicker wire is $10 \mathrm{\Omega }$. The total resistance of the combination will be

If a wire of resistance $R$ is melted and recast to half of its length, then new resistance of the wire will be:

Imagine you have a conductor. The cross sectional area of the conductor is increased by $2$ and the length of the conductior is made twice. If the initial resistance was R, what is the final resistance?