Electrostatic Potential And Capacitance Ques 28
28. 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
[2010]
(a) remain same
(b) become zero
(c) increases
(d) decrease
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Answer:
Correct Answer: 28.(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 $K>1, \therefore E^{\prime}<E$
BETA
