STANDARD Physics Capacitance MCQ Question
A capacitor made of two circular plates each of radius 12 cm and separated by 5 mm. The capacitor is being charged by an external source. The charging current is constant and equal to 0.15 A. The capacitance of the parallel plate capacitor in
40 pF
45 pF
70 pF
80 pF
Correct Answer
Detailed Explanation
The capacitance of a parallel plate capacitor is given by C = ε₀A/d. Here, A = πR² = 3.14 × (0.12)² m² = 4.5 × 10⁻² m², d = 5 × 10⁻³ m, and ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻². Substituting these values, C = (8.85 × 10⁻¹² × 4.5 × 10⁻²) / (5 × 10⁻³) = 80 pF.
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