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
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.
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.
If the charges are brought closer together, what happens to the electrostatic 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?
If two charges exert a force of 5 N on each other, what will be the force if the distance between them is tripled?
State Coulomb’s Law in words.
The force between two charges in air is 10 N. If the charges are placed in water (relative permittivity = 80), what is the new force?
Two charges of +2 C and +3 C are placed 1 m apart in vacuum. Calculate the force between them.
What does Coulomb’s Law describe?
What happens to the force between two charges if the distance between them is reduced to half?
What is meant by the term 'relative permittivity' in Coulomb’s Law?
What is the direction of the force on a positive charge due to another positive charge?
What is the effect of increasing the relative permittivity of the medium between two charges?
What is the effect of the sign of charges on the direction of the force between them?
What is the force between two charges of +1 C and -1 C separated by 2 m in vacuum?
