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a. How many excess electrons must be add...

a. How many excess electrons must be added to one plate and removed from the other to give a `5.000 nF` parallel plate capacitor `25.0 J` of stored energy ?
b. How could you modify the geometry of this capacitor so that can store `50.0 J` of energy without changing the charge on its plates?

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Without changing charge on the plates, we can make C half. `C=(epsi_(0)A)/(d)`, i.e. double the plate separation or inserting dielectric of dielectric of a value such that C becomes.
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