The number of vectors of unit length perpendicular to vectors ¯a=(1,1,0) & ¯b=(0,1,1) is :
A
1
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B
2
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C
3
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D
∞
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Solution
The correct option is D2 There exists two unit length vectors perpendicular to both of the vectors →a and →b and it is given by →a×→b|→a×→b| and →b×→a|→a×→b|.