WAEC Physics 2017 Theory — Question 26
Question 26 of 33 from the West African Examinations Council (WAEC) Physics 2017 Theory paper, with the correct answer and a full explanation.
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11(a)(ii) A parallel plate capacitor consists of two plates each of area 9.6x10^-3m², separated by a dielectric of thickness 2.25x10^-4m and dielectric constant 900. Calculate the capacitance of the capacitor. [εo=permittivity of free space=8.85x10^-12Fm^-1]
Model answer
A=9.6x10^-3m²; d=2.25x10^-4m; εr=900, εo=8.85x10^-12Fm^-1. Capacitance C = εrεoA/d = (8.85x10^-12 x 900 x 9.6x10^-3)/(2.25x10^-4) = (7.65x10^-11)/(2.25x10^-4) = 3.4x10^-7F.
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