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A unit vector along the common perpendicular of lines with directions b1, b2 is:
A(b1 x b2)/|b1 x b2|
B(b1 . b2)/(|b1||b2|)
C(b1 + b2)/|b1 + b2|
D(b1 - b2)/|b1 - b2|
Answer & Solution
Correct answer: A. (b1 x b2)/|b1 x b2|
The cross product b1 x b2 is perpendicular to both directions, and dividing by its length makes it a unit vector.
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