Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

The vector $(\cos \alpha \cos \beta) \hat{i}+(\cos \alpha \cos \beta) \hat{j}+(\sin \alpha) \hat{k}$ is a

A. null vector

B. unit vector

C. a constant vector

D. none of these

Solution:

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