A parallel-plate capacitor has capacitance 2.00 µF.?
(a) How much energy is stored in the capacitor if it is connected to a 21.00 V battery?
_____ µJ
(b) If the battery is disconnected and the distance between the charged plates doubled, what is the energy stored?
_____ µJ
(c) The battery is subsequently reattached to the capacitor, but the plate separation remains as in part (b). How much energy is stored?
____ µJ
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Verified answer
a)
E = 1/2 C U^2 = 0.5 x 2 10^-6 x 21^2= 441 µJ
b) the same 441 µJ
c) C distance between the charged plates doubled ( C = k x S /d )
C = 1µF
E = 0.5 x 1 .10^-6 x 21 ^2 = 220.5 µJ
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