A) a
B) 2 a
C) 0
D) None of these
Correct Answer: A
Solution :
Let \[\mathbf{a}=x\mathbf{i}+y\mathbf{j}+z\mathbf{k}\]. Then \[(\mathbf{a}.\mathbf{i})\mathbf{i}+(\mathbf{a}.\mathbf{j})\mathbf{j}+(\mathbf{a}.\mathbf{k})\mathbf{k}=\mathbf{a}.\]You need to login to perform this action.
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