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0 votes
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in Vector algebra by (36.3k points)

The unit vector(s) which is/are coplanar with vectors i + j + 2k, i + 2j + k and perpendicular to the vector i + j + k is given by 

(a) j – k 

(b) – i + j 

(c) i – j 

(d) – j + k

1 Answer

+1 vote
by (33.0k points)
selected by
 
Best answer

Answer is (d) - j + k

Explanation:

Let a = i + j + k,

b = i + j + 2k

and c = i + 2j + k

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