Hi, In cramster\'s response to this problem, it seem like they areusing a differ

Question

Hi, In cramster's response to this problem, it seem like they areusing a different equation for inital system energy than finalsystem energy---it looks like potential is squared forthe inital system energy but not the final. Is there areason for this or is it an error? Thanks!! Hi, In cramster's response to this problem, it seem like they areusing a different equation for inital system energy than finalsystem energy---it looks like potential is squared forthe inital system energy but not the final. Is there areason for this or is it an error? Thanks!!

Explanation / Answer

   Given :    In this solution     The final energy of the system U = 1/2 QVc      Where Q is charge on thecapacitor      Vc is the potentaildifference    The initial energy of the system U = 1/2 CV2 , This is the another form of energy stored ina capacitor.    [ Capacitance = charge / potentialdifference            C = Q / V ]    When you are using both Capacitance and potentialdifference , to find energy of a capacitor you should use      U = 1/2 C V2 So, this is correct method    [ Capacitance = charge / potentialdifference            C = Q / V ]    When you are using both Capacitance and potentialdifference , to find energy of a capacitor you should use      U = 1/2 C V2 So, this is correct method

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