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Question:

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 :

increase

decrease

remains same

become zero

Solution:

Electric field between two parallel plates placed in vacuum is given by
E = σ/ε₀
In a medium of dielectric constant K, E' = σ/(Kε₀)
For kerosene oil K > 1 ⇒ E' is less than E