JAMB Physics 2019 Objective — Question 28
Question 28 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.
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If the distance between two point charges is increased by a factor of four, the magnitude of the electrostatic force between them will be
- A. increased to double
- B. reduced to one-sixteenth of the initial valueCorrect
- C. increased by a quarter
- D. quadrupled
Explanation
From F=Kq₁q₂/r², F∝1/r². If distance increases by 4× (r₂=4r₁): F₂=F₁r₁²/(4r₁)²=F₁/16 — reduced to one-sixteenth.
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