A parallel-platecapacitor is constructed from two 11 cm x 11 cm electrodes space

Question

A parallel-platecapacitor is constructed from two 11 cm x 11 cm electrodes spaced1.0 mm apart. The capacitor plates are charged to ±9 nC,then disconnected from the battery.
(a) How much energy is stored in the capacitor?
Answer = __________________ J (b) Insulating handlesare used to pull the capacitor plates apart until the spacing is2.0 mm. Now how much energy is stored in thecapacitor? Answer =_________________ J
(a) How much energy is stored in the capacitor?
Answer = __________________ J (b) Insulating handlesare used to pull the capacitor plates apart until the spacing is2.0 mm. Now how much energy is stored in thecapacitor? Answer =_________________ J

Explanation / Answer

the area of the plates is A = 11 cm *11 cm                                        = 121*10-4 m2 the separation between the plates is d = 1.0 m m =1.0*10-3 m the charge on the plates is Q = ± 9*10-9 C the capacitance of the capacitor is C =o A / d                                                         = ---------- F a) the energy stored in the capacitor is E = 1/2(Q2 / C )                                                              = --------- J b ) if the separation between the plates is d ' =2*10-3 m then the capacitance is      C' = o A / d ' now the energy stored is E = 1/2 ( Q2/ C )                                             =----------- J the separation between the plates is d = 1.0 m m =1.0*10-3 m the charge on the plates is Q = ± 9*10-9 C the capacitance of the capacitor is C =o A / d                                                         = ---------- F a) the energy stored in the capacitor is E = 1/2(Q2 / C )                                                              = --------- J b ) if the separation between the plates is d ' =2*10-3 m then the capacitance is      C' = o A / d ' now the energy stored is E = 1/2 ( Q2/ C )                                             =----------- J

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