Electric Forces & Fields Test

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Electric Forces & Fields Test - 6

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Question 1
4 / -1

An electric field can deflect

A
X rays

B
α – rays

C
γ - rays

D
Neutrons

Solution

Only alpha rays are moving with small velocity and having charge so they will be affected by electric field.
Question 2
4 / -1

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 3
4 / -1

Conservation of charges in tribo electric charging

A
Implies both are negatively charged.

B
Implies half are positively charged and the other half are neutral.

C
Implies one is positively charged and the other is negatively charged.

D
Implies both are positively charged.

Solution

The triboelectric effect (also known as triboelectric charging) is a type of contact electrification in which certain materials become electrically charged after they come into frictional contact with a different material.
Example: Rubbing glass with fur, or a plastic comb through the hair.
When we charge something with static electricity, no electrons are made or destroyed. Electrons are just moved from one place to another. The net electric charge stays the same. This is called the principle of conservation of charge.
i.e. If a glass rod is rubbed with silk, some electrons moves from glass rod to silk no new charge is generated or destroyed.
Question 4
4 / -1

Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then,

A
Negative and distributed non–uniformly over the entire surface of the sphere

B
Negative and distributed uniformly over the surface of the sphere.

C
Negative and appears only at the point on the sphere closest to the point charge

D
Zero.

Solution

If a charge q is placed outside than the electric field lines incident on the conducting sphere , if some charge is developed due to thee lines than opposite surface becomes oppositely charge and the total charge becomes zero.
Question 5
4 / -1

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

Acc to coulomb's law unlike charges always attract each other while like charges always repel each other.
Question 6
4 / -1

Ionization of a neutral atom is the

A
Only gain of one or more electrons

B
Only gain of one or more protons

C
Gain or loss of one or more electrons

D
Only gain of one or more neutrons

Solution

It is not possible to remove or add protons/neutrons to an atom, but electrons can be added or removed by an atom easily.
By adding electrons it becomes negatively charged.
By removing electrons it becomes positively charged.
Question 7
4 / -1

A charge q is placed at the center of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to

A
Q/2

B
-Q/4

C
Q/5

D
Q/3

Solution

Suppose in the following figure, equilibrium of charge B is considered. Hence for its equilibrium,
Question 8
4 / -1

The 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

The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges. The electric force between stationary charged bodies is conventionally known as the electrostatic force.
Question 9
4 / -1

Two charges A = -2.50 μC and B = 6.0 μC are at a distance of 1 meter from each other. Distance from A at which the electric field is zero in meters is

A
2.03

B
1.85

C
2.22

D
1.92

Solution

where,
x = distance of the null point from the small charge
d = distance between two charges
q₂= bigger charge
q₁= small charge
+1 for like charges and -1 for unlike charges
Question 10
4 / -1

Conductors are materials

A
That allow movement of electrons

B
That allow movement of protons

C
That allow only random movement of electrons

D
That allow movement of neutrons

Solution

Conductors are materials that permit electrons to flow freely from particle to particle. An object made of a conducting material will permit a charge to be transferred across the entire surface of the object.