Coulomb's law Quiz
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5 questions, one answer each
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1. Two charges repel each other with force F. One charge is doubled and the separation is doubled. The new force is
- A. F/2
- B. F
- C. 2F
- D. F/4
2. Which statement about Coulomb's law is correct?
- A. It applies only to uncharged bodies
- B. It is an inverse square law
- C. Air must be treated differently from a vacuum at A Level
- D. The force depends on the sum of the charges
3. A charged sphere of radius 3 cm has its centre 20 cm from a small charge. What value of r is used in Coulomb's law?
- A. 3 cm
- B. 17 cm
- C. 20 cm
- D. 23 cm
4. The unit of ε₀ is equivalent to
- A. F m⁻¹
- B. N m² C⁻²
- C. C N m⁻²
- D. F m
5. Why is gravity the main force shaping the Solar System, even though electrostatic forces between particles are far stronger?
- A. Gravity is a stronger force between particles
- B. Electrostatic forces cannot act in space
- C. Planets are almost neutral so electrostatic forces cancel, whereas gravity always adds
- D. Electrostatic forces are always repulsive