Electric potential at any point is $V = -5x + 3y + \sqrt {15} z$, then the magnitude of the electric field is
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$\mathrm{V}=-5 \mathrm{x}+3 \mathrm{y}+\sqrt{15} \mathrm{z}$
$\mathrm{E}_{\mathrm{x}}=-\frac{\mathrm{dV}}{\mathrm{dx}}=5 \quad ; \quad \mathrm{E}_{y}=-3: \mathrm{E}_{z}=-\sqrt{15}$
$\Rightarrow \mathrm{E}=\sqrt{25+9+15}$
$\Rightarrow \mathrm{E}=7$
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