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Let vec a = 2i-j+k, vec b = i+2j-k and ...

Let ` vec a = 2i-j+k, vec b = i+2j-k` and `vec c = i+j-2k` be three vectors. A vector in the plane of `vec b` and `vec c` whose projection on `vec a` is of magnitude `sqrt(2/3)` is

A

2i+3j-3k

B

2i+3j+3k

C

- 2i+5j+5k

D

2i+j+5k

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The correct Answer is:
A
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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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