In which of the following media, the force of Coulomb decreases more as compared to thevacuum?
Correct answer: D. Insulators
- A. Gases
- B. Metals
- C. Liquids
- D. Insulators
Explanation
Insulators (D): Insulators, particularly those specifically designed as dielectric materials, have high dielectric constants. These materials are chosen precisely for their ability to store electrical energy and reduce electric fields. Their dielectric constants can range from a few units to hundreds or even thousands (e.g., Barium Titanate can have a dielectric constant of 1200). Therefore, insulators cause the most significant decrease in Coulomb's force among the given options (excluding the special case of metals causing complete screening).
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About Coulomb's Law
Coulomb's law gives the electrostatic force between two point charges in terms of their magnitudes, separation and the medium between them. Questions involve attraction and repulsion, the inverse square relationship, superposition of forces and vector direction, which must not be confused with the electric field produced by a charge.
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