Between the plates of a parallel plate condenser there is $1\,mm$ thick paper of dielectric constant $4$. It is charged at $100\;volt$. The electric field in $volt/metre$ between the plates of the capacitor is
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(b) $E = \frac{V}{d} = \frac{{100}}{{{{10}^{ - 3}}}} = 10,0000\,V/m$
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