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Question

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

A
2i+6j+k¯¯¯¯¯¯41
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B
2i+3j¯¯¯¯¯¯13
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C
3jk¯¯¯¯¯¯10
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D
4i+3j3k¯¯¯¯¯¯34
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Solution

The correct option is C 3jk¯¯¯¯¯¯10
As we know, a vector caplanar to a, b and
orthogonalto c is λ{(a×b)×c}.
A vector coplanar to (2i+j+k),(ij+k)
and orthogonal to (3i+2j+6k).
=λ[{2i+j+k)×(ij+k)}×(3i+2j+6k)]
=λ21j+7k
A unit vector is ±a×b×ca×b×c
=±21j+7k212+72=±3jk¯¯¯¯¯¯10

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