Question Detail
Question
A parallel plate air capacitor is made of 0.2m square plates, 1cm apart, connected to 50V. What is the charge?
Correct Answer
Option A is the correct answer.
Detailed Explanation
A = 0.2×0.2 = 0.04m². C = ε₀A/d = 8.85×10^-12 × 0.04 / 0.01 = 3.54×10^-11 F. Q = CV = 3.54×10^-11 × 50 = 1.77×10^-9 C = 1.77 nC.
Hint
Q = CV, where C = ε₀A/d.