Module 2 : Electrostatics
Lecture 10 : Potential Energy of a System of Charges
   
\includegraphics{fig36A.eps}
   
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  Thus the surfaces are concentric spheres with the origin (the location of the charge) as the centre and radii given by
 
\begin{displaymath}R = \frac{q}{4\pi\epsilon_0\phi_0}\end{displaymath}

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