Coulomb’s Law

Physics ⇒ Electricity and Magnetism

Coulomb’s Law starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Coulomb’s Law. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

Describe how the force between two charges changes if both charges are tripled and the distance between them is doubled.

Describe the effect of the sign of charges on the direction of the force according to Coulomb’s Law.

Describe the superposition principle as it applies to electrostatic forces.

Explain the significance of the inverse square nature of Coulomb’s Law.

Calculate the force between two charges of +2 μC and -3 μC placed 0.5 m apart in vacuum. (Take k = 9 × 10⁹ N·m²/C²)

Calculate the force between two charges of 1 C each placed 1 m apart in air. (k = 9 × 10⁹ N·m²/C²)

If the electrostatic force between two charges is 5 N in air, what will it be in a medium with ε_r = 10?

If the force between two charges is F in air, what will be the force between them in a medium of relative permittivity 5?

Coulomb’s Law is an example of which type of law? (1) Inverse square law (2) Direct proportionality law (3) Conservation law (4) Ohm’s law

Which of the following best describes the nature of the electrostatic force? (1) Contact force (2) Non-contact force (3) Frictional force (4) Gravitational force

Which of the following correctly represents the SI unit of electric charge? (1) Coulomb (2) Newton (3) Joule (4) Volt

Which of the following is NOT a property of the electrostatic force? (1) It is a central force (2) It is a conservative force (3) It depends on the velocity of charges (4) It acts along the line joining the charges

Fill in the blank: The electrostatic force acts along the line ______ the two charges.

Fill in the blank: The electrostatic force is much ______ than the gravitational force between two protons.

Fill in the blank: The force between two charges in a medium of relative permittivity ε_r is ______ times the force in vacuum.

If the distance between two point charges is doubled, the electrostatic force between them becomes ______ of its original value.

True or False: Coulomb’s Law applies only to point charges in vacuum.

True or False: The electrostatic force between two charges depends on the mass of the charges.

True or False: The electrostatic force between two charges is always along the line joining them, regardless of the presence of other charges.

True or False: The magnitude of the electrostatic force is independent of the sign of the charges.