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In a region of constant potential
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the electric field is zero
,
there can be no charge inside the region
the electric field is zero
,
there can be no charge inside the region
As we know, the relation between electric field intensity E and electric potential $V$ is $E=\frac{-d V}{d r}$ as $E=0$ and for $V=$ constant. $\frac{\mathrm{dV}}{\mathrm{dr}}=0$
Thus electric field intensity $\mathrm{E}=0$.
Thus electric field intensity $\mathrm{E}=0$.
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