Electrostatics Test

Result

Electrostatics Test - 10

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Weekly Quiz Competition

Question 1
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 statements(s).

A
The angular momentum of the charge -q is constant

B
The linear momentum of the charge -q is constant

C
The angular velocity of the charge -q is constant

D
The linear speed of the charge -q is constant
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

A charge of 1 µC is divided into two parts such that their charges are in the ratio of 2 : 3. These two charges are kept at a distance 1 m apart in vacuum. Then, the electric force between them (in N) is

A
0.216

B
0.00216

C
0.0216

D
2.16

Solution
Question 4
4 / -1

A solid spherical conductor of radius R has a spherical cavity of radius a (a < R) at its centre. A charge + Q is kept at the centre. The charge at the inner surface, outer surface and at a position r (a < r < R) are respectively

A
+ Q, -Q, 0

B
-Q,+ Q, 0

C
0, -Q, 0

D
+ Q, 0, 0
Question 5
4 / -1

A

B

C

D

Solution
Question 6
4 / -1

Two identical metal spheres charged with + 12μF and –8µF are kept at certain distance in air. They are brought into contact and then kept at the same distance. The ratio of the magnitudes of electrostatic forces between them before and after contact is

A
12 : 1

B
8 : 1

C
24 : 1

D
4 : 1

Solution
Question 7
4 / -1

The force of interaction between two charges q₁ = 6 μC and q₂ = 2 μC is 12 N. If charge q = – 2 μC is added to each of the charges, then the new force of interaction is

A
2 × 10^-7 N

B
zero

C
30 N

D
2 × 10^-3 N

Solution
Question 8
4 / -1

Two charges +q and –q are kept apart. Then, at any point on the right bisector of line joining the two charges

A
the electric field strength is zero

B
the electric potential is zero

C
both electric potential and electric field strength are zero

D
both electric potential and electric field strength are non-zero

Solution
Question 9
4 / -1

A comb runs through one's dry hair attracts small bits of paper. This is due to

A
comb is a good conductor

B
paper is a good conductor

C
the atoms in the paper get polarised by the charged comb

D
the comb possesses magnetic properties
Question 10
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 uniformly over the surface of the sphere

B
negative and appears only at the point on the sphere closest to the point charge

C
negative and distributed non-uniformly over the entire surface of the sphere

D
zero