Post-UTME Physics 2017 Objective — Question 16
Question 16 of 20 from the Post-UTME Screening (Post-UTME) Physics 2017 Objective paper, with the correct answer and a full explanation.
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The force between two equal point charges of magnitude 2.0uC is equal to 0.4N. Calculate the distance between the charges.
- A. 90cm
- B. 60cm
- C. 30cmCorrect
- D. 10cm
Explanation
F = kq1q2/r^2. 0.4 = 9x10^9 x (2x10^-6)^2/r^2. r^2 = 0.036/0.4 = 0.09, so r = 0.3m = 30cm.
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