A) \[-1\]
B) \[-\frac{1}{2}\]
C) \[\frac{1}{2}\]
D) \[1\]
Correct Answer: B
Solution :
Vectors are perpendicular to each other Cross product is zero \[\vec{A}=2\hat{i}+3\hat{j}+8\hat{k}\] \[\vec{B}=4\hat{j}-4\hat{i}+\alpha \hat{k}\] \[\vec{A}.\vec{B}=0\] \[-8+12+8\alpha =0\] \[8\alpha =-4\] \[\alpha =-\frac{1}{2}\]You need to login to perform this action.
You will be redirected in
3 sec