A) \[-\,2\]
B) 8
C) \[-\,7\]
D) \[-\,8\]
Correct Answer: D
Solution :
[d] \[\text{\vec{A}}\,\text{.}\,\text{\vec{B}}\,\text{=}\,\text{0}\] \[\text{or }\left( 5\hat{i}+7\hat{j}-3\hat{k} \right).\left( 2\hat{i}+2\hat{j}-a\hat{k} \right)=0\] \[\therefore 5\times 2+7\times 2+3a=0\text{ }or\text{ }a=-8\]You need to login to perform this action.
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