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Which of the following is a conductor of electricity?
Glass
Copper
Wood
Rubber
Copper
Copper is a metal with free electrons that allow electric current to pass through it easily. Materials that permit the flow of charge are classified as conductors, while those that do not are classified as insulators.
Copper is a metal with free electrons that allow electric current to pass through it easily. Materials that permit the flow of charge are classified as conductors, while those that do not are classified as insulators.
This concept of electrical conductivity is fundamental to the study of Physics under the Electricity chapter, which is a standard syllabus component for RRB, SSC, and UPSC General Science sections.
Copper has high electrical conductivity, ranking only behind silver among all metals.
The SI unit of electrical conductivity is Siemens per meter (S/m).
Silver is the best conductor of electricity, but copper is commonly used in wiring due to its cost-effectiveness.
Glass, wood, and rubber are categorized as insulators or dielectrics because their electrons are tightly bound to their atoms.
Insulators have a very high resistivity and an extremely low conductivity.
Copper is preferred for domestic wiring because it possesses a good balance of high conductivity, ductility, and resistance to corrosion.
Option A (Glass), C (Wood), and D (Rubber) are insulators and do not conduct electricity under standard conditions.
B is correct тАФ Copper is a highly conductive metal that facilitates the movement of electrons, unlike the insulators provided in the other options.
In exams, always look for the material with the lowest resistivity; remember the order of conductivity: Silver > Copper > Gold > Aluminum.
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