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Question

Find the unit vectors perpendicular to given pair of vectors:ijk,i+2jk,

A
12(i+k)
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B
15(i+2k)
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C
110(i+3k)
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D
12(ik)
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Solution

The correct option is A 12(i+k)
The vector perpendicular to each, ijk,i+2jk, is,
∣ ∣ijk111121∣ ∣=3i+3k
Thus required unit vector is 12(i+k)

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