Two charges are placed at a certain distance apart in vacuum. If an insulating slab is placed between them, then force will
Correct answer: B. Decrease
- A. Increase
- B. Decrease
- C. Remains constant
- D. Be zero
Explanation
When an insulating slab, also known as a dielectric, is placed between two charges, the force between them will generally decrease. This is because the dielectric reduces the effective electric field between the charges due to its polarization. The Coulomb force between the charges is inversely proportional to the permittivity of the medium between them. When a dielectric with a relative permittivity is introduced, As, F= ( 1/4πε0 εr) .(q1 q2 /r2)
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An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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