vectors-m

Question: If $\mathbf{r}\,.\,\mathbf{i}=\mathbf{r}\,.\,\mathbf{j}=\mathbf{r}\,.\,\mathbf{k}$ and $|\mathbf{r}|\,\,=3,$ then $\mathbf{r}=$



1) $\pm \,3\,(\mathbf{i}+\mathbf{j}+\mathbf{k})$
2) $\pm \,\frac{1}{3}\,(\mathbf{i}+\mathbf{j}+\mathbf{k})$
3) $\pm \,\frac{1}{\sqrt{3}}\,(\mathbf{i}+\mathbf{j}+\mathbf{k})$
4) $\pm \,\sqrt{3}\,(\mathbf{i}+\mathbf{j}+\mathbf{k})$
Solution: Explanation: No Explanation
Scalar Product Dot Product

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