vectors-m

Question: The vector a coplanar with the vectors i and j, perpendicular to the vector $\mathbf{b}=4\mathbf{i}-3\mathbf{j}+5\mathbf{k}$ such that $|\mathbf{a}|\,=\,|\,\mathbf{b}|$ is



1) $\sqrt{2}\,(3\mathbf{i}+4\mathbf{j})$ or $-\sqrt{2}\,(3\mathbf{i}+4\mathbf{j})$
2) $\sqrt{2}\,(4\mathbf{i}+3\mathbf{j})$ or $-\sqrt{2}\,(4\mathbf{i}+3\mathbf{j})$
3) $\sqrt{3}\,(4\mathbf{i}+5\mathbf{j})$ or $-\sqrt{3}\,(4\mathbf{i}+5\mathbf{j})$
4) $\sqrt{3}\,(5\mathbf{i}+4\mathbf{j})$ or $-\sqrt{3}\,(5\mathbf{i}+4\mathbf{j})$
Solution: Explanation: No Explanation
Scalar Product Dot Product

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