Electrostatic Potential and Capacitance - Result Question 32
34. 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
[2010]
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Answer:
Correct Answer: 34. (d)
Solution:
- (d) Electric field between two parallel plates placed in vacuum
$E=\frac{\sigma}{\varepsilon_o}=\frac{Q}{A \varepsilon_0}$
In a medium of dielectric constant $K$
$E^{\prime}=\frac{\sigma^{-}}{E_o K}$
For kerosene $K>1, \therefore E^{\prime}<E$
