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(a) remain same(b) become zero(c) increases(d) decrease

Answer 1

it depends upon the permittivity of the kerosene oil!!

Answer 2

Answer:

D) Decrease

Explanation:

Charge of the plate = + Q and – Q

Electric field between two parallel plates placed in vacuum is given by -

E = σ/2e0

In a medium of dielectric constant K.

When the plates are dipped in kerosene oil tank, then the electric field between the plate will be

E = σ/2e0k

Since, the dielectric constant of Kerosene oil K > 1, thus E'<E

If the plates are now dipped in kerosene oil tank, the electric field between the plates will decrease