Electrostatics Test

Result

Electrostatics Test - 38

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Weekly Quiz Competition

Question 1
4 / -1

Two spheres A and B of radius 4 cm and 6 cm are given charges of 80 µc and 40 µc respectively. If they are connected by a fine wire, the amount of charge flowing from one to the other is

A
20µC from A to B

B
16µC from A to B

C
32µC from B to A

D
32µC from A to B

Solution
Question 2
4 / -1

In identical mercury droplets charged to the same potential V coalesce to form a single bigger drop. The potential of new drop will be

A

B

C

D

Solution
Question 3
4 / -1

An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like

A
A

B
B

C
C

D
D
Question 4
4 / -1

The intensity of the electric field required to keep a water drop of radius 10^–5 cm just suspended in air when charged with one electron is approximately (g = 10 newton / kg, e = 1.6 × 10^–19 coulomb)

A
260 volt/cm

B
260 newton /coulomb

C
130 volt/cm

D
130 newton /coulomb

Solution
Question 5
4 / -1

A
Is zero

B
Depends upon E

C

D
Depends upon the atomic number of the conducting element
Question 6
4 / -1

Three particles, each having a charge of 10 µC are placed at the corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of the system is

A
Zero

B
Infinite

C
27 J

D
100 J

Solution
Question 7
4 / -1

The electric field near a conducting surface having a uniform surface charge density σ is given by

A

B

C

D

Solution
Question 8
4 / -1

There is an electric field E in X-direction. If the work done on moving a charge 0.2 C through a distance of 2 m along a line making an angle 60° with the X-axis is 4.0, what is the value of E?

A

B
4N/C

C
5N/C

D
None of these

Solution
Question 9
4 / -1

Four equal charges Q are placed at the four corners of a square of each side is \'a\'. Work done in removing a charge –Q from its centre to infinity is

A
0

B

C

D

Solution
Question 10
4 / -1

A
2 : 1

B
1 : 2

C
1 : 4

D
4 : 1

Solution