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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > 1 . (a) How many excess electrons must be added to one plate and removed from the other to give a 5.00 nF parallel plate capactior 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?

1 . (a) How many excess electrons must be added to one plate and removed from the other to give a 5.00 nF parallel plate capactior 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?

A charge Q is uniformly distributed over a long rod AB of elngth L as shown in the figure. The electric potential at the point O lying at a distance L from the end A is