A) \[\frac{\mathbf{i}+\mathbf{j}}{2}\]
B) \[\frac{\mathbf{j}+\mathbf{k}}{2}\]
C) \[\frac{\mathbf{k}+\mathbf{i}}{2}\]
D) None of these
Correct Answer: B
Solution :
\[\left[ (\mathbf{i}+\mathbf{j})\,.\,\frac{(\mathbf{j}+\mathbf{k})}{\sqrt{2}} \right]\frac{(\mathbf{j}+\mathbf{k})}{\sqrt{2}}=\frac{(\mathbf{j}+\mathbf{k})}{2}.\]
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