Q. Two parallel metal plates having charges +Q and –Q face each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will
A) Become zero
B) Increase
C) Decrease
D) Remain same
Explanation
[Solution from source] With fixed charges ±Q the field between the plates is σ/(Kε₀) in a dielectric instead of σ/ε₀ in air. Kerosene has K > 1, so the field decreases. The charge on isolated plates does not change, so the field cannot remain the same. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.