The radius of the dome of a Van de Graaff generator is 0 . 13 m . If dielectric strength of the surrounding air is 3 × 10 6 V m - 1 then, the maximum magnitudes for the charge and potential of the dome are given by,

V max = 390 kV , Q max = 5 .63 μC

V max = 40 kV , Q max = 5 .63 μC

V max = 410 kV , Q max = 4 .32 μC

V max = 390 kV , Q max = 5 .31 μC

EASY

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Which of the following device works on the principle that the charge between the two flow if they are connected by a conducting wire:

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Important Questions on Electrostatics

EASY

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

The number of electrons in one

coulomb

charge is

MEDIUM

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

Ten charges are placed on the circumference of a circle of radius

R

with constant angular separation between successive charges. Alternate charges

1, 3, 5, 7, 9

have charge

(+ q)

each, while

2, 4, 6, 8, 10

have charge

(- q)

each. The potential V and the electric field E at the centre of the circle are respectively : (Take

V = 0

at infinity)

EASY

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

Two identical conducting spheres A and B carry equal charge. They are initially separated by a distance much larger than their diameters and the force between them is F. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to C and removed. As a result, the force between A and B now is

HARD

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

Two isolated conducting spheres

S_{1}

and

S_{2}

of radius

\frac{2}{3} R

and

\frac{1}{3} R

have

12 μ C

and

- 3 μ C

charges, respectively, and are at a large distance from each other, They are now connected by a conducting wire. A long time after this is done the charges on

S_{1}

and

S_{2}

are respectively:

EASY

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

As shown in the figure, two particles, each of mass $' m'$ tied at the ends of a light string of length $2 a$ are kept on a frictionless horizontal surface. When the mid point $(P)$ of the string is pulled vertically upwards with a small but constant force $F,$ the particles move towards each other on the surface. Magnitude of acceleration of each particle, when the separation between them becomes $2 x$ is

Question Image

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Physics>Electricity and Magnetism>Electrostatics>Electrostatics

A Van de Graff generator has a spherical metal shell as an electrode which is at a potential

15 \times 10^{6} V

. If the dielectric strength of the surrounding medium is

5 \times 10^{7} {Vm}^{- 1}

then the diameter of the shell is

EASY

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?

EASY

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

Consider the principle of Van de Graaff generator. Now choose the correct statement(s) from the following.

EASY

Physics>Electricity and Magnetism>Electrostatics>Electrostatics

Two conducting sphere of radii