Electric charge and Coulomb’s law - One Line Questions
1.
What is the charge of a proton? —
+1.6 x 10^-19 C
2.
What is the dimension of electric charge? —
[A T]
3.
Which of the following is the smallest unit of charge that can exist independently? —
1 electron charge
4.
What is the value of the elementary charge, e? —
1.6 x 10^-19 C
5.
If a body has a charge of -1.6 C, how many excess electrons does it have? —
10^19
6.
If the distance between two point charges is reduced to half, the force between them increases by a factor of: —
4
7.
The force between two charges in a vacuum is 10 N. If the same charges are placed in a medium with a dielectric constant of 2, the force becomes: —
5 N
8.
The force between two charges is 12 N. If both charges are tripled, the force becomes: —
108 N
9.
If a charge of +2μC and a charge of -3μC are separated by 1 meter in vacuum, what is the approximate magnitude of the force between them? —
5.4 x 10^-3 N
10.
The force between two charges of +1 C each, separated by 1 meter in vacuum, is: —
9 x 10^9 N
11.
The value of Coulomb's constant (k) in vacuum is approximately: —
9 x 10^9 N m^2/C^2
12.
What is the mass of an electron? —
9.11 x 10^-31 kg
13.
What is the SI unit of electric charge? —
Coulomb
14.
The charge on a body is -3.2 μC. This means the body has: —
An excess of 2 x 10^13 electrons
15.
The force between two charges is repulsive. What can be said about the charges? —
Both A and B
16.
The force between two charges is attractive. What can be said about the charges? —
One is positive and one is negative
17.
Coulomb's law is analogous to Newton's law of gravitation in that: —
All of the above
18.
Which of the following is a consequence of charge conservation? —
The net electric charge of an isolated system is constant.
19.
Which of the following is a consequence of charge quantization? —
Charge can only exist in discrete multiples of the elementary charge.
20.
Which of the following statements about electric charge is INCORRECT? —
Charge is not conserved.
21.
Which of the following statements regarding electric charge is correct? —
All of the above
22.
The unit of electric charge in the CGS system is: —
Statcoulomb (esu)
23.
If two identical positive charges are brought closer together, the electrostatic force between them will: —
Increase
24.
If a positive charge and a negative charge are brought closer together, the electrostatic force between them will: —
Increase
25.
If the distance between two point charges is doubled, the force between them becomes: —
One-fourth
26.
Which of the following quantities is conserved in an isolated system? —
Electric charge
27.
The force between two charges is F. If the charges are placed in a medium with dielectric constant K, the new force will be: —
F / K
28.
The force between two point charges q1 and q2 separated by distance r in a medium of dielectric constant K is given by: —
F = (1/4πε₀K) * (q1*q2 / r^2)
29.
What is the force experienced by a charge q1 due to another charge q2? —
F = k * |q1*q2| / r^2
30.
Two identical metallic spheres, each with charge +Q, are separated by a distance r. If they are brought into contact and then separated to the same distance r, the force between them will: —
Decrease
31.
Two charges are placed at a certain distance apart. If a dielectric slab is inserted between them, the force between them will: —
Decrease
32.
If the medium between two charges is changed from vacuum to a dielectric medium with dielectric constant K > 1, the force between the charges: —
Decreases
33.
When a glass rod is rubbed with silk, the rod becomes positively charged because: —
It loses electrons
34.
Which of the following is a property of electric charge? —
It is quantized.
35.
The permittivity of free space (ε₀) is related to Coulomb's constant (k) by: —
k = 1 / (4πε₀)
36.
A dielectric constant (K) for a medium is always: —
Greater than or equal to 1
37.
Coulomb's law describes the force between two: —
Stationary electric charges
38.
Coulomb's law is valid for: —
Point charges only
39.
When a neutral object gains electrons, its net charge becomes: —
Negative
40.
If the charges are removed from an object, the object becomes: —
Neutral
41.
Which fundamental particle carries a negative elementary charge? —
Electron
42.
Which of the following is NOT a fundamental property of electric charge? —
Polarization
43.
If the charge on an object is doubled, the electrostatic force between it and another fixed charge: —
Is doubled
44.
Coulomb's law can be expressed mathematically as F = k * |q1*q2| / r^2, where k is: —
Coulomb's constant
45.
In Coulomb's law, the constant 'k' is dependent on: —
The nature of the medium between the charges
46.
The force between two point charges is inversely proportional to: —
The square of the distance between them
47.
The force between two point charges is directly proportional to: —
The product of the charges
48.
The principle of superposition for electric forces states that: —
All of the above
49.
When a substance is rubbed with another, triboelectric effect causes: —
Transfer of charge
50.
When is the electrostatic force between two charges maximum? —
When they are in a vacuum