1.

Which of the following is a unit vector?

A. \[\hat{i}+\,\hat{j}\]
B. \[\cos \,\theta \hat{i}-\sin \,\theta \hat{j}\]
C. \[\sin \,\theta \hat{i}+2\,x\cos \theta \hat{j}\]
D. \[\frac{1}{\sqrt{3}}\,(\hat{i}+\,\hat{j})\]
Answer» C. \[\sin \,\theta \hat{i}+2\,x\cos \theta \hat{j}\]


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