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Find the dielectric constant of the medium?
Two point charges a distance $d$ apart in free space exert a force of $1.4\times10^{-4}N$. When the free space is replaced by a homogeneous dielectric medium, the force becomes $0.9\times10^{-4}N$. ...
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What force is acting on the charge in the dielectric?
For example I have a dielectric solid with a small charged ball in it. And I have external electric field $E$. So what force is acting on this ball?
The field in dielectric is $\frac{E}{\epsilon}$, ...
