Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

Force between the protons and neutrons in a nucleus is

A
Only coulombian

B
Only nuclear

C
Both (a) and (b)

D
None of these

Solution
Question 2
1 / -0

The diagram shows an electron in a uniform electric field.
In which direction will the field accelerate the electron?

A
A

B
B

C
C

D
D

Solution

We know that
$$F= qE$$
$$\implies ma = (-e)E$$
$$\implies a = - \dfrac{eE}{m}$$
Since the acceleration is negative .
So, the direction of electron is opposite to direction of Electric field.
Question 3
1 / -0

Which statement about electric charges in a uniform electric field is not correct?

A
Electric charges of the same magnitude, whether positive or negative, experience the same magnitude of force when placed in the same uniform electric field.

B
The direction of the force on a positive charge placed in a uniform electric field is independent of the magnitude of the charge.

C
The magnitude of the force on a positive charge placed in a uniform electric field is proportional to the magnitude of the electric field strength.

D
The work done to move a positive charge a certain distance in a uniform electric field is independent of the direction of the movement.

Solution

Option D.
When the a positive charge move in direction of the electric field then work done is positive.But when the charge moves in opposite direction of electric field, negative work is done.
So, option D is incorrect.
Question 4
1 / -0

If the potential at each point on a conductor is same to each other, then

A
Electric lines of force may begin or end on the same conductor

B
No electric lines of force may begin or end on the same conductor

C
The electric field inside the conductor may be non-zero

D
None of the above

Solution

Electric field lines explain the orientation of the electric field in the region and it points tangential to the point at which it is drawn. Thus at any point, the tangent to the electric field line matches the direction of the electric field.
The density of the field lines at a point determines the strength of the electric field at that point.
Therefore, if the potential at each point of the conductor is the same, then it means that there are no electric lines that may begin or end on the conductor.
Question 5
1 / -0

For the metallic conductor.

A
Dielectric constant must be zero

B
Dielectric constant must not be infinity

C
Dielectric constant must be infinity

D
Dielectric constant may be infinity

Solution
Question 6
1 / -0

If two charged particles of same mass and charge are projected in a uniform electric field with the same speed, then

A
Both have same momentum at any instant

B
Both have same kinetic energy at any instant

C
Both have same magnitude of momentum at any instant

D
They may move on a straight line

Solution
Question 7
1 / -0

Identical charges of magnitude $$Q$$ are placed at $$(n - 1)$$ corners of a regular polygon of $$n$$ sides each corner of the polygon is at a distance $$r$$ from the centre. The field at the centre is

A
$$\dfrac {kQ}{r^{2}}$$

B
$$(n - 1)\dfrac {kQ}{r^{2}}$$

C
$$\dfrac {n}{(n - 1)}\dfrac {kQ}{r^{2}}$$

D
$$\dfrac {(n - 1)}{n} k \dfrac {Q}{r^{2}}$$

Solution
Question 8
1 / -0

A hollow sphere of charge does not produce electric field at any

A
Interior point

B
Outer point

C
Beyond $$2m$$

D
Beyond $$10 cm$$

Solution
Question 9
1 / -0

Two identically charged spheres when suspended by strings of equal lengths make an angle of $$30^{\circ}$$ with each other. The angle remains the same when they are immersed in a liquid of density less than the density of the material of the spheres. Choose the correct option

A
The electric force between them increases

B
The electric force between them decreases

C
The net downward force will increase

D
The net downward force will remain unchanged

Solution
Question 10
1 / -0

Coulomb's law is applicable to

A
Point charges

B
Spherical charges

C
Like charges

D
All of these

Solution