A) i
B) j
C) k
D) \[\frac{\mathbf{i}+\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]
Correct Answer: C
Solution :
Obviously, \[\mathbf{b}+\mathbf{c}=-2\mathbf{i}+4\mathbf{j}\] and \[\mathbf{a}+\mathbf{b}=3\mathbf{j}.\] Hence the unit vector \[\mathbf{k}\] is perpendicular to both \[\mathbf{b}+\mathbf{c}\] and \[\mathbf{a}+\mathbf{b}.\]You need to login to perform this action.
You will be redirected in
3 sec