Electrostatics Test

Result

Electrostatics Test - 90

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Weekly Quiz Competition

Question 1
4 / -1

A force F acts between sodium and chlorine ions of salt (sodium chloride) when put 1 cm apart in air. The permittivity of air and dielectric constant of water are ɛ₀ and K respectively. When a piece of salt is put in water electrical force acting between sodium and chlorine ions 1 cm apart is

A
F / k

B
FK / ɛ₀

C
F / Kɛ₀

D
FFɛ₀ / K

Solution
Question 2
4 / -1

Two similar spheres having +q and –q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as

A
Zero having no direction

B
8F towards +q charge

C
8F towards –q charge

D
4F towards +q charge

Solution
Question 3
4 / -1

When air is replaced by a dielectric medium of constant k, the maximum force of attraction between two charges separated by a distance

A
Decreases k times

B
Remains unchanged

C
Increases k times

D
Increases k^–1 times
Question 4
4 / -1

A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to X-rays for a short period. Then

A
The divergence of leaves will not be affected

B
The leaves will diverge further

C
The leaves will collapse

D
The leaves will melt
Question 5
4 / -1

One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge.Then

A
Mass of A and mass of B still remain equal

B
Mass of A increases

C
Mass of B decreases

D
Mass of B increases
Question 6
4 / -1

The force between two charges 0.06m apart is 5 N. If each charge is moved towards the other by 0.01m, then the force between them will become

A
7.20 N

B
11.25 N

C
22.50 N

D
45.00 N

Solution
Question 7
4 / -1

Two charged spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant 2, then what is the force (if all conditions are same)?

A
F/2

B
F

C
2F

D
4F

Solution
Question 8
4 / -1

Two point charges +3 µC and +8 µC repel each other with a force 40 N. If a charge of –5 µC is added to each of them, then the force between them will become

A
–10 N

B
+ 10 N

C
+ 20 N

D
–20 N

Solution
Question 9
4 / -1

When 10¹⁹ electrons are removed from a neutral metal plate, the electric charge on it is

A
–1.6 C

B
+1.6 C

C
10⁺¹⁹ C

D
10^–19 C

Solution
Question 10
4 / -1

Electric charges of 1 µC, –1µC and 2µC are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length each side 10 cm. The resultant force on the charge at C is

A
0.9 N

B
1.8 N

C
2.7 N

D
3.6 N

Solution