SATHEE: Electrostatic Potential and Capacitance

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

(d) decrease

[2010]

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Answer:

Correct Answer: 34. (d)

Solution:

(d) Electric field between two parallel plates placed in vacuum

$E = \frac{σ}{ε_{o}} = \frac{Q}{A ε_{0}}$

In a medium of dielectric constant $K$

$E^{'} = \frac{σ^{-}}{E_{o} K}$

For kerosene $K > 1, ∴ E^{'} < E$

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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

Answer:

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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