A parallel plate capacitor of capacitance 1 μ F is charged to a potential difference of 20 V . The distance between plates is 1 μ m . The energy density between plates of capacitor is.

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Energy density ​ = 2 1 ​ ε 0 ​ E 2 = 2 1 ​ ε 0 ​ ( d V ​ ) 2 = 2 1 ​ ( 8.85 × 1 0 − 12 ) ( 1 0 − 6 20 ​ ) 2 J / m 3 ≃ 1.8 × 1 0 3 J / m 3 ​

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