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IMPORTANT
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The capacitance of a parallel plate capacitor 10 μF. If now the overlapping area of plates are doubled and separation of the plates is halved, then the new capacitance will be

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Important Questions on Electrostatics

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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 19
The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this parallel plate capacitor equal to that of the sphere of diameter 20 cm, the distance between the plates will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 20
A conductor bears a charge of 2 mC at potential 103 V. The capacitance of capacitor is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 21
The energy density (energy per unit volume) in an electric field caused by a point charge falls off with the distance from the point charge as
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 22
A battery used for charging an air capacitor is removed after the capacitor is fully charged. Some mica sheets (dielectric constant K ) are inserted between the two plates. If E is the energy of the air capacitor, then the energy stored in the mica capacitor will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 23
When a soap bubble is charged
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IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 24
A parallel plate air condenser is charged by connecting it to a battery. The battery is disconnected and then a sheet of glass of dielectric constant 8 is inserted between the plates. In this context, which of the following would be true?
I. The potential difference between the plates is reduced by a factor of eight.
II. Potential difference between the plates is increased by a factor of eight.
III. Electric field between the plates is reduced by a factor of eight.

Select the correct answer from the options given below.

EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 25
Two electrons are separated by a distance of 1 Ao. The coulomb force between them will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 26
Two electric charges +q and -q are situated at a distance apart from each other. The electric field E and the potential V at the midpoint between the charges will be characterised