Electrostatics Test

Result

Electrostatics Test - 33

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Question 1
4 / -1

Number of electrons in one coulomb of charge will be

A
5.46 × 10²⁹

B
6.25 × 10¹⁸

C
1.6 × 10⁺¹⁹

D
9 × 10¹¹

Solution
Question 2
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

Solution
Question 3
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 4
4 / -1

The force between two charges 0.06m apart is 5N. 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 5
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 6
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 7
4 / -1

Electric charges of 1µC,–1 µC 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
Question 8
4 / -1

Charge on α–particle is

A
4.8 × 10^–19C

B
1.6 × 10^–19C

C
3.2 × 10^–19C

D
6.4 × 10^–19C

Solution
Question 9
4 / -1

Two charges are at a distance `d\' apart. If a copper plate (conducting medium) of thickness d/2 is placed between them, the effective force will be

A
2F

B
F/2

C
0

D
Question 10
4 / -1

Two electrons are separated by a distance of 1Å. What is the coulomb force between them

A
2.3 × 10^–8 N

B
4.6 × 10^–8 N

C
1.5 × 10^–8 N

D
None of these

Solution