Coulomb’s Law
Physics ⇒ Electricity and Magnetism
Coulomb’s Law starts at 9 and continues till grade 12.
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See sample questions for grade 9
Describe one similarity and one difference between Coulomb’s Law and Newton’s Law of Universal Gravitation.
Describe what is meant by a point charge.
Explain why Coulomb’s Law is not applicable for very large charges or very small distances.
Explain why the force between two charges decreases when the medium between them is not vacuum.
A charge of +1 μC is placed 0.2 m from a charge of +2 μC in vacuum. Calculate the force between them.
A charge of +5 μC and a charge of -5 μC are placed 10 cm apart in air. Calculate the force between them.
If the force between two charges is 20 N in air, what will be the force if the charges are placed in a medium with relative permittivity 4?
If the force between two charges is 8 N and one charge is doubled, what is the new force?
Coulomb’s Law applies to which type of charges?
(1) Only positive charges
(2) Only negative charges
(3) Both positive and negative charges
(4) Only neutral objects
If the distance between two charges is doubled, the force between them becomes:
(1) Four times greater
(2) Twice as great
(3) One-fourth as great
(4) Half as great
If the magnitude of both charges is doubled, the force between them becomes:
(1) Unchanged
(2) Doubled
(3) Quadrupled
(4) Halved
Which law is similar in form to Coulomb’s Law?
(1) Newton’s Law of Universal Gravitation
(2) Ohm’s Law
(3) Faraday’s Law
(4) Ampere’s Law
Fill in the blank: The direction of the force between two like charges is ________.
Fill in the blank: The electrostatic force is a ________ force, meaning it acts without physical contact.
Fill in the blank: The force between two charges is measured in ________.
Fill in the blank: The value of the electrostatic constant (k) depends on the ________ between the charges.
True or False: Coulomb’s Law can be applied to extended bodies of charge without any approximation.
True or False: Coulomb’s Law is an example of an inverse square law.
True or False: The electrostatic force acts along the line joining the two charges.
True or False: The electrostatic force between two charges depends on the shape of the charges.
