Question Detail
Question
A parallel plate air capacitor is made of 0.2 m square tin plates and 1 cm apart. It is connected to a 50 V battery. What is the charge on each plate?
Correct Answer
Option A is the correct answer.
Detailed Explanation
C = ε0A/d = (8.85×10⁻¹²)(0.04)/(0.01) ≈ 3.54×10⁻¹¹F, so Q = CV ≈ 3.54×10⁻¹¹ × 50 ≈ 1.77×10⁻⁹ C = 1.77 nC.
Hint
First find capacitance from plate geometry, then use Q = CV.