Q. 10

Two metal plates A. increase

B. decrease

C. remain the same

D. become zero

Answer :

Dielectric constant of a substance is the factor>1) by which the capacitance increases from its vacuum value, when the dielectric is inserted fully between the plates of the capacitor


Where,


C=capacitance in presence of dielectric


C0=capacitance in presence of vacuumK=1)


The electric field between the plates of a capacitor when the space between the plates is filled with a dielectric of dielectric constant K is given by



Where,


Q=charge on the capacitor


A=area of metal plates


K=dielectric constant


ϵ0=permittivity of vacuum


When dipped in oil tank value of K>1


When oil is removed there is air between the plates with K~1


the value of K decreases when oil is pumped out


By the formula,



So as K decrease from greater than 1 to 1 , the electric field increases.


Therefore, after pumping out oil, the electric field between the plates increases.

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