Electric Charges and Fields Test 5

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Electric Charges and Fields Test 5

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Weekly Quiz Competition

Question 1
1 / -0

Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is 6.5×10⁻⁷ C? The radii of A and B are negligible compared to the distance of separation.

A
4.5×10⁻²N

B
2.5×10⁻²N

C
1.5×10⁻²N

D
3.5×10⁻²N

Solution
Question 2
1 / -0

Two charges 1C and -4C exists in air. What is the direction of force?

A
Away from 1C

B
Away from -4C

C
From 1C to -4C

D
From -4C to 1C

Solution

Since the charges are unlike, the force will be attractive. Thus the force directs from 1C to -4C.
Question 3
1 / -0

Ratio of the permittivity of medium to the permittivity of free space is known as

A
Dielectric ratio

B
Dielectric permittivity

C
Dielectric constant

D
Dielectric medium

Solution

Where ∈_r is called the dielectric constant or relative permittivity of the medium
Question 4
1 / -0

An infinite number of charges, each equal to 4C, are placed along the x-axis at x = 1 m, x = 2 m, x = 4 m, x = 8 m and so on. The total force on a charge of 1C placed at the origin is

A
48 × 10⁸ N

B
4.8 × 10⁹ N

C
48 × 10⁴ N

D
4.8 × 10¹⁰ N

Solution
Question 5
1 / -0

Two point charges 3μC and + 7μC repel each other with a force of 12 N. If each is given an additional charge -5 μC, what will be the new force between them?

A
2.28 N repulsive

B
5.28 N repulsive

C
2.28 N attractive

D
5.28 N attractive

Solution
Question 6
1 / -0

Electrostatic force is

A
Force exerted by an electron on a neutron

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 moving in a given frame of reference

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

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 7
1 / -0

Two positive charges

A
Repel each other

B
Attract each other at times and repel at other times

C
Attract each other

D
Always attract each other

Solution

According 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 8
1 / -0

Under the influence of the coulomb field of charge +Q, a charge −q is moving around it in an elliptical orbit. Find out the correct statement(s).

A
The linear momentum of the charge −q is constant

B
The angular velocity of the charge −q is constant

C
The angular momentum of the charge −q is constant

D
The linear speed of the charge −q is constant

Solution

Since the charge –q is moving in elliptical orbit so to make its motion stable the total angular momentum of the charge is constant since it experience a centripetal force from the charge +Q so it follow the motion as the motion of earth around sun.
Question 9
1 / -0

The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

A
60 N

B
30 N

C
40 N

D
15 N

Solution

Coulombs law states the force between two charged particles is directly proportional to the product of charges and inversely proportional to the square of distance between them.
So if the distance is doubled then the force would decrease 4 times.
So the new force would be 120/4=30 Newton.
Question 10
1 / -0

When the distance between two charged particle is halved, the force between them becomes

A
One fourth

B
One half

C
Double

D
Four times

Solution

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Electric Charges and Fields Test 5

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Electric Charges and Fields Test 5

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Question 1

4.5×10−2N

2.5×10−2 N

1.5×10−2 N

3.5×10−2 N

Solution

Question 2

Away from 1C

Away from -4C

From 1C to -4C

From -4C to 1C

Solution

Question 3

Dielectric ratio

Dielectric permittivity

Dielectric constant

Dielectric medium

Solution

Question 4

48 × 108 N

4.8 × 109 N

48 × 104 N

4.8 × 1010 N

Solution

Question 5

2.28 N repulsive

5.28 N repulsive

2.28 N attractive

5.28 N attractive

Solution

Question 6

Force exerted by an electron on a neutron

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

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

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

Solution

Question 7

Repel each other

Attract each other at times and repel at other times

Attract each other

Always attract each other

Solution

Question 8

The linear momentum of the charge −q is constant

The angular velocity of the charge −q is constant

The angular momentum of the charge −q is constant

The linear speed of the charge −q is constant

Solution

Question 9

60 N

30 N

40 N

15 N

Solution

Question 10

One fourth

One half

Double

Four times

Solution

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4.5×10⁻²N

2.5×10⁻²N

1.5×10⁻²N

3.5×10⁻²N

48 × 10⁸ N

4.8 × 10⁹ N

48 × 10⁴ N

4.8 × 10¹⁰ N