1
IIT-JEE 1993
MCQ (More than One Correct Answer)
+2
-0.5
Let $$\vec a = 2\hat i - \hat j + \hat k,\vec b = \hat i + 2\hat j - \hat k$$ and $$\overrightarrow c = \widehat i + \widehat j - 2\widehat k - 2\widehat k$$ be three vectors. A vector in the plane of $${\overrightarrow b }$$ and $${\overrightarrow c }$$, whose projection on $${\overrightarrow a }$$ is of magnitude $$\sqrt {2/3,} $$ is :
A
$$2\widehat i + 3\widehat j - 3\widehat k$$
B
$$2\widehat i + 3\widehat j + 3\widehat k$$
C
$$-2\widehat i - \widehat j + 5\widehat k$$
D
$$2\widehat i + \widehat j + 5\widehat k$$
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