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What does this variable coefficient represent of electric field of dipole?
$V:=\text{potential at point P}$
$V=\frac{2Qd\cos(\theta)}{4\pi \epsilon_{0}r^{2}}$
$E_{r}=-\frac{\partial V}{\partial r}$
$E_{\theta}=-\frac{1}{r}\frac{\partial V}{\partial \theta}$
The problem for ...
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Electric field and potential [duplicate]
Suppose we consider a point dipole i.e. an ideal dipole. At the origin the potential:
$$ \phi(\mathbf r) = \frac{1}{4\pi\epsilon_0} \frac{\mathbf p\cdot\hat{\mathbf r}}{r^2}$$
is undefined due to ...
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