Module 2 : Electrostatics
Lecture 9 : Electrostatic Potential
  and
\begin{eqnarray*} E_z &=& -\frac{\partial}{\partial z}\left[\frac{pz}{4\pi\epsil... ...+z^2)^{5/2}}\\ &=& \frac{p}{4\pi\epsilon_0}\frac{2z^2-y^2}{r^5} \end{eqnarray*}
B.
 POLAR COORDINATES
  In polar ( $r-\theta$) coordinates, the radial and tangential components of the field are as follows :
 
\begin{eqnarray*} E_r &=& -\frac{\partial \phi}{\partial r} = \frac{2p\cos\theta... ...l \phi}{\partial \theta} = \frac{p\sin\theta}{4\pi\epsilon_0r^3} \end{eqnarray*}
   
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