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In an electric field the potential at a point is given by the following relation \( \mathrm{V}=\frac{343}{\mathrm{r}} \). The electric field at \( \vec{r}=3 \hat{i}+2 \hat{j}+6 \hat{k} \) is :
\( P \)
W.
\( \begin{array}{ll}\text { (A) } 21 \hat{i}+14 \hat{j}+42 \hat{k} & \text { (B*) } 3 \hat{i}+2 \hat{j}+6 \hat{k}\end{array} \)
(C) \( \frac{1}{7}(3 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}+6 \hat{\mathrm{k}}) \)
(D) \( -(3 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}+6 \hat{\mathrm{k}}) \)
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