A) ? 6
B) ? 8
C) ? 10
D) ? 12
Correct Answer: C
Solution :
Since angle between the vectors is \[{{90}^{o}}\], therefore dot product of the vectors will be zero or \[(4\mathbf{i}+\mathbf{j}-\mathbf{k})\,.\,(3\mathbf{i}+m\mathbf{j}+2\mathbf{k})=0\] or \[12+m-2=0\] or \[m=-10.\]You need to login to perform this action.
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