(a) C=εₒ•A/d=8.85•10^-12•25•10^-4/0.001=
=2.21•10^-11F,
(b) E=CU²/2=...
(a) Find the capacitance of a parallel-plate capacitor made of two 5 cm×5 cm square plates separated by 1 mm.
(b) If 50 V is applied to this capacitor, how much energy is stored?
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