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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 10
Describe how the medium between two charges affects the electrostatic force between them.
Describe the effect of the sign of charges on the direction of the force between them.
Explain why Coulomb’s Law is called an inverse square law.
State Coulomb’s Law.
A charge of +5 μC is placed 0.2 m from a charge of -2 μC in air. Calculate the magnitude of the force between them. (k = 9 × 10⁹ N·m²/C²)
Calculate the force between two charges of +1 C each placed 1 m apart in vacuum. (k = 9 × 10⁹ N·m²/C²)
If the distance between two charges is increased by a factor of 3, by what factor does the force change?
If the force between two charges is F, what will be the force if the distance between them is reduced to half?
Coulomb’s Law applies to which type of charges? (1) Point charges (2) Distributed charges (3) Both (4) None
If the distance between two charges is doubled, the electrostatic force between them becomes (1) four times (2) half (3) one-fourth (4) double
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 best explains why Coulomb’s Law is not valid for large-sized charged bodies? (1) The law is only for point charges. (2) The law is only for moving charges. (3) The law is only for neutral bodies. (4) The law is only for conductors.
Fill in the blank: The electrostatic force acts along the line _______ the two charges.
Fill in the blank: The force between two charges is inversely proportional to the _______ of the distance between them.
Fill in the blank: The value of the permittivity of free space (ε₀) is _______ F/m.
The SI unit of electric charge is _______.
True or False: Coulomb’s Law can be applied to charges in motion.
True or False: Coulomb’s Law is a vector law.
True or False: The direction of the electrostatic force depends on the nature of the charges.
True or False: The force between two charges increases as the distance between them increases.