Electrostatics Test

Result

Electrostatics Test - 35

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Question 1
4 / -1

The charges on two spheres are +7µC and – 5µC respectively. They experience a force F. If each of them is given and additional charge of –2µC, the new force of attraction will be

A
F

B
F/2

C

D
2F

Solution
Question 2
4 / -1

Two equally charged, identical metal spheres A and B repel each other with a force \'F\' The spheres are kept fixed with a distance ‘r’ between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is

A
F

B
3F/4

C
F/2

D
F/4

Solution
Question 3
4 / -1

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

A
F/8

B
F/4

C
4F

D
F/16

Solution
Question 4
4 / -1

An infinite number of charges, each of charge 1µC, are placed on the x-axis with co-ordinates x = 1, 2, 4, 8, ...... ∞. If a charge of 1C is kept at the origin, then what is the net force acting on 1C charge

A
9000 N

B
12000 N

C
24000 N

D
36000 N

Solution
Question 5
4 / -1

The top of the atmosphere is at about 400 kV with respect to the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about 100 Vm^–1. Still, we do not get an electric shock as we step out of our house into the open house because (assume the house to be a steel cage so that there is no field inside)

A
There is a potential difference between our body and the ground

B
100 Vm^–1 is not a high electric field so that we do not feel the shock

C
Our body and the ground forms an equipotential surface

D
The atmosphere is not a conductor
Question 6
4 / -1

Four metal conductors having different shapes
1. A sphere
2. Cylindrical
3. Pear
4. Lightning conductor
are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is

A
1

B
2

C
3

D
4
Question 7
4 / -1

Identify the wrong statement in the following. Coulomb\'s law correctly describes the electric force that

A
Binds the electrons of an atom to its nucleus

B
Binds the protons and neutrons in the nucleus of an atom

C
Binds atoms together to form molecules

D
Binds atoms and molecules together to form solids
Question 8
4 / -1

Which of the following will represent Coulomb\'s law?

A

B

C

D
Question 9
4 / -1

A comb run 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 polarized by the charged comb

D
The comb possesses magnetic properties
Question 10
4 / -1

Two charges +6µC and + 15µC are placed along the x-axis at x = 0 and x = 2m respectively. A negative charge is placed between them such that the resultant force on it is zero. The negative charge is placed at

A
x = 0.775 m

B
x = 1.2 m

C
x = 0.5 m

D
Position depends on the amount of charge

Solution