Electrostatics Test

Result

Electrostatics Test - 86

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Weekly Quiz Competition

Question 1
4 / -1

An electron falls through a small distance in a uniform electric field of magnitude 2 × 10⁴ NC^–1. The direction of the field is reversed keeping the magnitude unchanged and a proton falls through the same distance. The time of fall will be

A
Same in both cases

B
More in the case of an electron

C
More in the case of proton

D
Independent of charge

Solution
Question 2
4 / -1

A point charge is surrounded symmetrically by six identical charges at distance r as shown in the figure. How much work is done by the forces of electrostatic repulsion when the point charge q at the centre is removed at infinity

A
Zero

B

C

D

Solution
Question 3
4 / -1

A
6 q

B
– 6 q

C
5 q

D
– 5 q

Solution
Question 4
4 / -1

Identify the WRONG statement

A
In an electric field two equipotential surfaces can never intersect

B

C
Electric field at the surface of a charged conductor is always normal to the surface

D
The electric potential decrease along a line of force in an electric field
Question 5
4 / -1

Figure shows a charged conductor resting on an insulating stand. If at the point P the charge density is a, the potential is V and the electric field strength is E, what are the values of these quantities at point Q Charge density Potential Electric intensity

A
(a)

B
(b)

C
(c)

D
(d)

Solution
Question 6
4 / -1

Two points charge – q and + q/2 are situated at the origin and at the point (a, 0, 0) respectively. The point along the X–axis where the electric field vanishes is

A

B

C

D

Solution
Question 7
4 / -1

Two identical balls having like charges and placed at a certain distance apart repel each other with a certain force. They are brought in contact and then moved apart to a distance equal to half their initial separation. The force of repulsion between them increases 4.5 times in comparison with the initial value. The ratio of the initial charges of the balls is

A
2

B
3

C
4

D
6

Solution
Question 8
4 / -1

The electric field in a region surrounding the origin is uniform and along the x–axis. A small circle is drawn with the centre at the origin cutting the axes at points A, B, C, D having co-ordinates (a, 0), (0, a), (– a, 0), (0, – a); respectively as shown in figure, then potential in minimum at the point

A
A

B
B

C
C

D
D
Question 9
4 / -1

In moving from A to B along an electric field line, the electric field does 6.4 × 10^–19 J of work on an electron, If ϕ₁, ϕ₂ are equipotential surfaces, then the potential differences (V_C – V_A)

A
– 4 V

B
4 V

C
Zero

D
64 V

Solution
Question 10
4 / -1

In the following figure two parallel metallic plates are maintained at different potential. If an electron is released midway between the plates, it will move

A
Right ward at constant speed

B
Left ward at constant speed

C
Accelerated right ward

D
Accelerated left ward