Coulomb’s Law defines the force between two point charges as:
a) Directly proportional to the product of their charges and inversely proportional to the square of the distance between them
b) Directly proportional to the distance between them and inversely proportional to the product of their charges
c) Inversely proportional to the sum of their charges
d) Directly proportional to the product of their charges and the square of the distance
The magnitude of the electrostatic force between two charges depends on:
a) The sum of their charges
b) The product of their charges and the distance between them
c) The distance between them alone
d) The individual values of the charges
What is the unit of electric charge in the SI system?
a) Volt
b) Ampere
c) Coulomb
d) Tesla
In Coulomb’s Law, the constant k is known as:
a) Gravitational constant
b) Electrostatic constant
c) Boltzmann constant
d) Planck constant
Coulomb’s constant (k) is approximately equal to:
a) 9 × 10⁹ N·m²/C²
b) 8.85 × 10⁻¹² N·m²/C²
c) 6.67 × 10⁻¹¹ N·m²/kg²
d) 1.6 × 10⁻¹⁹ C
The force between two charges is doubled when:
a) The charges are doubled
b) The distance is halved
c) The distance is doubled
d) The charges are halved
Which of the following factors does not affect the electrostatic force between two charges?
a) The magnitude of the charges
b) The distance between the charges
c) The medium in which the charges are placed
d) The mass of the charges
If two charges are placed 3 meters apart and the force between them is 9 N, what happens to the force if the distance is reduced to 1 meter?
a) The force becomes 9 N
b) The force becomes 27 N
c) The force becomes 81 N
d) The force becomes 3 N
Coulomb’s Law is valid for point charges and:
a) Charges in a vacuum only
b) Charges at a fixed distance
c) Spherically symmetric charge distributions
d) Moving charges
What is the effect of a dielectric medium on the electrostatic force between charges?
a) Increases the force
b) Decreases the force
c) Does not affect the force
d) Reverses the direction of the force
The electric force between two charges is attractive if:
a) The charges are of the same sign
b) The charges are opposite in sign
c) The charges are equal
d) The charges are different in magnitude
In Coulomb’s Law, the force between two charges is proportional to:
a) The sum of the charges
b) The difference of the charges
c) The product of the charges
d) The square of the distance between them
The electric field E due to a point charge is:
a) Directly proportional to the charge and inversely proportional to the square of the distance
b) Directly proportional to the square of the charge and inversely proportional to the distance
c) Inversely proportional to both the charge and the square of the distance
d) Independent of the charge
The force between two charges is 1 N. If the distance between them is tripled, the new force will be:
a) 1 N
b) 3 N
c) 9 N
d) 0.11 N
Which of the following materials will increase the electrostatic force between two charges?
a) Vacuum
b) Air
c) Water
d) Glass
Two point charges are placed in air. The force between them is F. If the medium is changed to a dielectric with dielectric constant K, the force becomes:
a) F/K
b) KF
c) F × K
d) K/F
What is the force between two charges of 1 C each, placed 1 meter apart in a vacuum?
a) 9 × 10⁹ N
b) 9 N
c) 1 N
d) 1 × 10⁹ N
The charge on an electron is:
a) Positive
b) Negative
c) Zero
d) Undefined
The electric field due to a positive point charge points:
a) Towards the charge
b) Away from the charge
c) In a circular motion around the charge
d) Perpendicular to the charge
Which of the following describes the force between two identical point charges when their distance is halved?
a) The force is halved
b) The force remains unchanged
c) The force doubles
d) The force quadruples
What happens to the electrostatic force if the distance between two charges is doubled?
a) The force is halved
b) The force is reduced to one-fourth
c) The force is doubled
d) The force remains the same
The electric force between two charges is 100 N. If the distance between them is reduced by half, the new force becomes:
a) 200 N
b) 50 N
c) 400 N
d) 25 N
Which of the following pairs of charges will result in an attractive force?
a) Positive and positive
b) Negative and negative
c) Positive and negative
d) Two neutral charges
The electrostatic force between two charges is:
a) Independent of the medium
b) Inversely proportional to the distance
c) Directly proportional to the distance
d) Inversely proportional to the square of the distance
If the force between two point charges is repulsive, the charges are:
a) Both positive
b) Both negative
c) One positive and one negative
d) None of the above
The electric field intensity at a point due to a charge is:
a) Inversely proportional to the square of the distance
b) Directly proportional to the square of the distance
c) Inversely proportional to the charge
d) Independent of the distance
The force between two charges of 5 µC and 10 µC, separated by 0.1 m, in air is:
a) 4.5 N
b) 2.25 N
c) 9 N
d) 1.8 N
The direction of the force between two charges depends on:
a) The magnitude of the charges
b) The sign of the charges
c) The distance between the charges
d) All of the above
