Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 7

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Two point charges $Q$ and $- 2 Q$ are placed at some distance apart. If the electric field at the location of $Q$ is $E$ , then the electric field at the location of $- 2 Q$ will be

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Important Questions on Electrostatics

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 8

A hollow sphere of copper is charged with a positive charge. The electric field inside the sphere will be

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 9

The radius of a metallic sphere, if its capacitance is

(\frac{1}{9}) μ F

, will be

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

Four charges,

Q

each are located at the four vertices of a regular tetrahedron of side

l

. The potential energy of the system will be

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 11

When the distance between the two charges as well as their magnitudes is decreased to half, then the force between them

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 12

The heat generated when condenser of

100 μ F

capacity is charged to

200 V

and discharged through a

2 Ω

resistance

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 13

The equivalent capacitance of the combination of three capacitors each of capacitance

C

between points

A

and

B

as shown in figure is,
Question Image

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 14

The radius of earth is

6400 km

. Then, its capacitance is,

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 15

125

water drops of equal radii and equal capacitance

C

coalesce to form a single drop of capacitance

C^{'}

. The relation between

C

and

C^{'}

is,