WAEC Physics 2024 Objective — Question 18
Question 18 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
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18. Two isolated charged spheres each of magnitude +1.0x10^-6 C are separated by a distance of 2.0x10^-1 m. Calculate the magnitude of the electrostatic force between them. [K=1/(4*pi*epsilon0)=9x10^9 Nm^2c^-2]
- A. 2.25x10^-1 NCorrect
- B. 4.50x10^-1 N
- C. 2.25x10^1 N
- D. 4.50x10^1 N
Explanation
F=Kq1q2/r^2 = 9x10^9 x1x10^-6x1x10^-6 / (0.2)^2 = 9x10^-3/0.04 = 0.225N = 2.25x10^-1N.
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