Question

Which of the following metals is a good conductor of electricity?
(A) Silver and Gold
(B) Copper and Aluminium
(C) Tungsten
(D) All of these

Answer 1

The substance which can allow the flow of electric current through it are called conductors. When certain electricity is applied to the substance, the electrons present in the substance will begin to move and thus cause the flow of electricity through it.

Complete solution:

Conductors are the substance which can allow the flow of electric current in any direction. Most of the metals are good conductors of electricity. Electricity will be generated only when the electrons move freely. During the flow of current, a long chain of momentum transfer is taking place between the mobile charge carriers. The materials that can conduct electricity include metals, semiconductors, superconductors, plasmas, electrolytes and conducting polymers.
The best conductor of electricity is the silver because it has a large number of free electrons present in it. Due to its high cost, its use is limited. It is used only in certain specialized equipment such as Satellites. Gold is also a good conductor, but cannot be used like other conductors due to high cost. One of the best properties of gold is that it does not oxidize immediately when it is exposed to air. Aluminium, copper and Tungsten are also good conductors. They are low cost and can be used for our daily purposes.

Therefore, Silver, Gold, Aluminium, Copper and Tungsten all are good conductors of electricity.

Hence, the correct answer is option (D) All of these.

Additional information:
Certain properties are given below:
- The movement of ions and electrons will be taking place inside the conductor.
- Conductor will be having a charge density of zero.
- Free charges will be present at the surface of the conductor.
- In the conductors, all points will have the same potential.

Note:

Resistance is the opposite of conductance. Resistance is reciprocal to the conductance.
Resistance is the opposing of the flow of electric current through the conductor.
The relation between resistance and conductance are given below:
$R = \dfrac{1}{G}$
Where,
R=Resistance of the material
G=Conductance of the material