Two plates are at potentials $-10\, V$ and $+30\, V$. If the separation between the plates be $2\, cm$. The electric field between them is.......$V/m$
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(a) $E = \frac{V}{d} = \frac{{30 - (\, - \,10)}}{{(2 \times {{10}^{ - 2}})}} = 2000\,V/m.$
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