Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 24

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IMPORTANT

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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.

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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 25

Two electrons are separated by a distance of

1 \overset{o}{A}

. 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

EASY

NDA & NA EE

IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 27

Two charges in air experience a coulomb force of

20 N

. If the space between them is filled with a medium of dielectric constant

K = 4

, then what is the new force?

EASY

NDA & NA EE

IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 28

An electron of mass

9 \times 10^{- 31} kg

and charge

1.6 \times 10^{- 19} C

is placed in an electric field of strength

9 \times 10^{6} N C^{- 1}

, the force on electron 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 30

A capacitor of

20 μ F

and charged to

500 V

is connected in parallel to another capacitor of

10 μ F

charged to

200 V

. The common potential 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 31

Two similarly charged bodies are kept

5 cm

apart in air. If the second body is shifted away from the first by another

5 cm

, their force of repulsion will be