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Module 2 : Electrostatics

Lecture 10 : Potential Energy of a System of Charges

	i.e.
	$\begin{displaymath}x^2 + y^2 = e^{-\frac{4\pi\epsilon_0\phi_0}{\lambda}}\end{displaymath}$
	which represent cylinders with axis along the z-axis with radii
	$\begin{displaymath}r = e^{-\frac{2\pi\epsilon_0\phi_0}{\lambda}}\end{displaymath}$

	$\includegraphics{fig36C.eps}$

	Click here for Animation
	As $\phi_0$ increases, radius becomes smaller. Thus the cylinders are packed closer around the axis, showing that the field is stronger near the axis.