A) \[5\mathbf{i}-5\mathbf{j}+5\mathbf{k}\]
B) \[5\mathbf{i}+5\mathbf{j}-5\mathbf{k}\]
C) \[-5\mathbf{i}+5\mathbf{j}+5\mathbf{k}\]
D) \[-5\mathbf{i}-5\mathbf{j}+5\mathbf{k}\]
Correct Answer: D
Solution :
\[\mathbf{r}\times \mathbf{F}=\left| \begin{matrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\ 2 & -1 & 1 \\ 1 & 2 & 3 \\ \end{matrix} \right|=-5\mathbf{i}-5\mathbf{j}+5\mathbf{k}.\]You need to login to perform this action.
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