1.

Let \[\overrightarrow{A}=\hat{i}A\,\cos \theta +\hat{j}A\,\sin \theta \] be any vector. Another vector \[\overrightarrow{B}\] which is normal to A is                                    [BHU 1997]

A.                 \[\hat{i}\,B\,\cos \theta +j\,B\sin \theta \]
B.                             \[\hat{i}\,B\,\sin \theta +j\,B\cos \theta \]
C.                 \[\hat{i}\,B\,\sin \theta -j\,B\cos \theta \]          
D.                 \[\hat{i}\,B\,\cos \theta -j\,B\sin \theta \]
Answer» D.                 \[\hat{i}\,B\,\cos \theta -j\,B\sin \theta \]


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