A 2.50-nF parallel-plate capacitor is charged to an initial potential difference ΔVi = 100 V and is then isolated. The dielectric material between the plates is paper, with a dielectric constant of 3.7. Requried:
a. How much work is required to withdraw the mica sheet?
b. What is the potential difference across the capacitor after the mica is withdrawn?

Explanation:

Formula to calculate the energy stored in a capacitor when it is filled with air is,

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Here, is the energy stored in a capacitor when it is filled with air.

is the parallel plate capacitor.

[/tex]V_{\mathrm{i}}[/tex] is the initial potential difference.

Substitute for and for to find the

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Formula to calculate the energy stored in a capacitor when it is filled with dielectric is,

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