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Question

The unit vector which is orthogonal to the vector a=3i+2j+6k and is coplanar with the vectors b=2i+j+k and c=ij+k is

A
141(2i6j+k)
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B
2i3j13
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C
3jk10
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D
4i+3j3k14
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Solution

The correct option is A 3jk10
Vector co-planer of b and c is given by,
p=b+λc=2^i+^j+^k+λ(^i^j+^k)=(2+λ)^i+(1λ)^j+(1+λ)^k
Also p is orthogonal to apa=0

(2+λ)3+(1λ)2+(1+λ)6=0λ=2

Thus p=3^j^k.
Hence required unit vector is p|p|=3^j^k10

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