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 11

Describe the effect of increasing the magnitude of one of the charges on the electrostatic force between two charges.

Describe the superposition principle as it applies to electrostatic forces.

Explain how the electrostatic force changes if the medium between two charges is changed from air to water.

Explain why Coulomb’s Law is called an inverse square law.

A charge of +4 μC is placed at the origin and another charge of +6 μC is placed at x = 3 m. Calculate the force on the +6 μC charge. (k = 9 × 10⁹ N·m²/C²)

If three charges are placed at the corners of an equilateral triangle, explain how you would find the net force on one of the charges.

Two charges, +q and -q, are placed 1 m apart in air. What is the nature of the force between them?

A charge of +3 μC is placed at the origin, and a charge of -3 μC is placed at (0, 4 cm) on the y-axis. Calculate the magnitude and direction of the force on the charge at the origin. (k = 9 × 10⁹ N·m²/C²)

If the distance between two point charges is doubled, the electrostatic force between them becomes: (1) Four times (2) Twice (3) One-fourth (4) Half

Which of the following best describes the nature of the force between two like charges? (1) Attractive (2) Repulsive (3) Zero (4) Depends on the medium

Which of the following factors does NOT affect the magnitude of the electrostatic force between two charges? (1) Magnitude of charges (2) Distance between charges (3) Shape of charges (4) Dielectric constant of medium

Which of the following is NOT a limitation of Coulomb’s Law? (1) It applies only to point charges (2) It is valid for charges at rest (3) It is valid for all distances (4) It does not consider the effect of the medium

Fill in the blank: The direction of the electrostatic force is along the ______ joining the two charges.

Fill in the blank: The electrostatic force is a ______ force, meaning it acts without physical contact.

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 is maximum when the medium between them is ______.

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

True or False: The electrostatic force between two charges increases as the distance between them increases.

True or False: The electrostatic force between two charges is always equal in magnitude and opposite in direction for both charges.

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