At a distance \( r \) from a point located at origin in space, the electric potential varies as ...

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At a distance \( r \) from a point located at origin in space, the electric potential varies as \( V=10 r \). Find the electric field at \( \vec{r}=3 \hat{i}+4 \hat{j}-5 \hat{k} \).
(1) \( \sqrt{2}(3 \hat{i}+4 \hat{j}-5 \hat{k}) \)
(2) \( -\sqrt{2}(3 \hat{i}+4 \hat{j}-5 \hat{k}) \)
(3) \( -\sqrt{3}(3 \hat{i}+4 \hat{j}-5 \hat{k}) \)
(4) None of these
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