Electrostatics Test

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Electrostatics Test - 5

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Question 1
1 / -0

Conductors are materials

A
that allow movement of protons

B
that allow movement of neutrons

C
that allow movement of electrons

D
that allow only random movement of electrons

Solution

Conductors are materials that permit electrons to flow freely from particle to particle. An object made of a conducting material will permit charge to be transferred across the entire surface of the object.
In conductors some electrons are unpaired so these electrons can move freely.
Question 2
1 / -0

Four point charges + q, + q, – q and – q are respectively placed at corners A, B, C and D of a square of side a. The electric potential at the centre O of the square is

A

B

C

D
zero
Question 3
1 / -0

A glass slab is held within the plates of a charged parallel plate condenser. Which of the following quantities does not change?

A
Energy of the condenser

B
Capacity

C
Intensity of electric field

D
Charge
Question 4
1 / -0

A neutral hydrogen molecule has two protons and two electrons. If one of the electrons is removed, we get a hydrogen molecular ion (). In the ground state of , the two protons are separated roughly by 1.5 and the electron is roughly at 1 from each proton. What is the potential energy of the system?

A
– 38.4 eV

B
– 19.2 eV

C
– 9.6 eV

D
Zero
Question 5
1 / -0

A parallel plate air-filled capacitor has a capacitance of 2 . When it is half-filled with a dielectric of dielectric constant k = 3, its capacitance becomes

A

B

C

D
Question 6
1 / -0

Charge is quantized means

A
charge cannot take any arbitrary values, but only values that are integral multiples of the fundamental charge(charge of proton/electron)

B
charges can take on any continuous value

C
charges can take on any discontinuous value

D
charges can take on discrete values that are multiples of charge on neutron

Solution

Total charge transferred from one body to other can be calculated by the number of electrons it is known as quantisation of charge given by q=±ne, where n= number of electrons , which should be an integer.
Question 7
1 / -0

A parallel plate capacitor has a voltage of 5 V between the two plates separated by 4 microns (1 micron = 10^-6 m). What is the electric field between the capacitor plates?

A
1.02 × 10⁵ V/m

B
1.25 × 10⁶V/m

C
3.4 × 10⁴V/m

D
4.3 × 10⁴V/m
Question 8
1 / -0

Two positive charges

A
repel each other

B
always attract each other

C
attract each other

D
attract each other at times and repel at other times

Solution

Acc to coulomb's law unlike charges always attract each other while like charges always repel each other so between two positive charges repulsion is working.
Question 9
1 / -0

A capacitor of capacitance C is fully charged by a 200 V supply. It is then discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat 2.5 10² J kg^–1 K^–1 and of mass 0.1 kg. If the temperature of the block rises by 0.4 K, then what is the value of C?

A

B

C

D
Question 10
1 / -0

The following figure shows a network of capacitors, where the numbers indicate capacitances in microfarad. What must be the value of capacitance C, if the equivalent capacitance between points A and B is to be 1 ?

A

B

C

D
Question 11
1 / -0

If a positive charge is shifted from a low potential region to a high potential region, then what will happen to its potential energy?

A
It will decrease.

B
It will increase.

C
It will remain the same.

D
It may increase or decrease.
Question 12
1 / -0

A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at x = 0 and positive plate is at x = 3d. The slab is equidistant from the plates. The capacitor is given some charge. As x goes from 0 to 3d, so

A
the magnitude of the electric field remains the same

B
the direction of the electric field changes continuously

C
the electric potential increases continuously

D
the electric potential increases at first, then decreases and again increases
Question 13
1 / -0

The dielectric constant K of an insulator cannot be

A
3

B
6

C
8

D
Question 14
1 / -0

A capacitor of capacitance 1 micro F is charged to 1 kV. What is the energy stored?

A
0.5 J

B
3 J

C
5 J

D
3.4 J
Question 15
1 / -0

electrostatic force is

A
force exerted by one charge on another when the two are moving in a given frame of reference

B
force exerted by one charge on another when the two are at rest in a given frame of reference

C
force exerted by one charge on another when the two are accelerating in a given frame of reference

D
force exerted by an electron on a neutron

Solution

Electrostatics means charges at rest,or relatively at rest so this force can be applicable only when charge produce electric field which is constant which is possible only when charges at rest or relatively at rest.
Question 16
1 / -0

The electric potential due to an extremely short dipole, at a distance r from it, is proportional to

A

B

C

D
Question 17
1 / -0

The introduction of a metal plate between the plates of a parallel plate capacitor increases its capacitance by 4.5 times. If d is the separation of the two plates of the capacitor, then the thickness of the metal plate introduced is

A

B

C

D
d
Question 18
1 / -0

The electrical conductivity of Earth's atmosphere increases with altitude because of

A
number of ions

B
acceleration of protons

C
acceleration voltage

D
number of neutrons
Question 19
1 / -0

If n drops, each of capacitance C, coalesce to form a single big drop, the capacitance of the big drop will be

A

B

C

D
Question 20
1 / -0

Ionization of a neutral atom is the

A
gain or loss of one or more electrons

B
only gain of one or more neutrons

C
only gain of one or more electrons

D
only gain of one or more protons

Solution

It is not possible to remove or add protons to atom, but electron can be added or removed by an atom easily so charge can be developed on an atom by removing or adding electrons, by adding electrons it becomes negative charged ,by removing electrons it becomes positive charged.