If \[A=5\widehat{i}+7\widehat{j}-3\widehat{k}\] and \[B=2\widehat{i}+2 – McqOptions

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1.	If \[A=5\widehat{i}+7\widehat{j}-3\widehat{k}\] and \[B=2\widehat{i}+2\widehat{j}-a\widehat{k}\] are perpendicular vectors, the value of a is:
A.	\[-\,2\]
B.	8
C.	\[-\,7\]
D.	\[-\,8\]
Answer» E.

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