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JAMB Physics 1998 Question 6

Question 6

Gravitational Field

The force of attraction between two point masses is 10−4 N when the distance between them is 0.18 m. If the distance is reduced to 0.06 m, calculate the force.

  1. A.1.1 × 10−5 N
  2. B.3.3 × 10−5 N
  3. C.3.0 × 10−4 N
  4. D.9.0 × 10−4 N
Show the answer and explanation

Answer: D (9.0 × 10−4 N)

Explanation

F ∝ 1/r2. The distance is divided by 3, so the force is multiplied by 9: 9.0 × 10−4 N.