Electric conduction is high in:
Correct answer: C. Solid graphite
- A. Solid nuclei
- B. Sugar solution
- C. Solid graphite
- D. None
Explanation
The conduction of electricity depends on the movement of electrons and other charged particles (ions). Metals have free electrons and thus can conduct electricity in a solid state but as the temperature increases, the collision between the electrons also increases, and thus the resistance to the flow of current increases. Liquids can conduct electricity if they are ionic (liquid mercury is metal and hence the conduction is by the same mechanism as for metals). Salt solutions, molten salts, etc, conduct electricity. Gases are insulators and don't conduct electricity unless the ionization potential is exceeded. Lightning is an example of the breakdown of the insulation of air.
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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