JAMB Physics 2019 Objective — Question 36

Question 36 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.

A conducting sphere has a net charge of -4.8×10⁻¹⁷C. What is the approximate number of excess electrons on the sphere if the fundamental natural charge is -1.6×10⁻¹⁹C?

A. 100
B. 300Correct
C. 200
D. 400

Explanation

Number of electrons = Total charge/Charge per electron = (−4.8×10⁻¹⁷)/(−1.6×10⁻¹⁹) = 300.

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