1. The problem statement, all variables and given/known data A conducting sphere of radius 100cm is charged to a potential of 30 volts. a) What is the charge on the sphere? b) What is the energy stored in the field? c) If the sphere is connected to a second identical uncharged sphere by a long wire, what is the final energy in the system? You can neglect any interference. 2. Relevant equations Q=CV C=4πεr U=(1/2)CV^2 3. The attempt at a solution For part A I find the capacitance of the sphere so I can then apply Q=CV to find the charge. C=4π(8.85X10^-12)(100)=1.1X10^-8 Q=(1.1X10^-8)(30)=3.3X10^-7 For part B I used the energy equation U=(1/2)(1.1X10^-8)(900)=4.95X10^-6 I am pretty much stuck on part C. Since it is a conducting sphere the potential for both of them should be the same. So I tried equating both potential equations such as V=(kq1)/(r)=(kq2)/(r). Both spheres are identical so I get that q1=q2. Not really clear on how to find the final energy.