An ideal, isolated, air-filled parallel-plate capacitor is not connected to a battery but has equal and opposite charges of 3.9 nC on its plates. The separation between the plates initially is 1.2 mm, and for this separation the capacitance is 3.1 × 10^-11 F. How much work must be done to pull the plates apart until their separation becomes 7.7 mm? (ε₀ = 8.85 × 10^-12C²/N ∙ m²)

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The Answer of An ideal, isolated, air-filled parallel-plate capacitor is not connected to a battery but has equal and opposite charges of 3.9 nC on its plates. The separation between the plates initially is 1.2 mm, and for this separation the capacitance is 3.1 × 10^-11 F. How much work must be done to pull the plates apart until their separation becomes 7.7 mm? (ε₀ = 8.85 × 10^-12C²/N ∙ m²)

An Ideal, Isolated, Air-Filled Parallel-Plate Capacitor Is Not Connected to a Battery