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Questions  

The vector that must be added to the vectors i^-2j^+3k^ and 6i^+3j^-7k^  so that the resultant vector is a unit vector along the Y-axis is

a
4i^+2j^+5k^
b
-7i^+4k^
c
3i^+4j^+5k^
d
null vector

detailed solution

Correct option is B

j^=(i^-2j^+3k^)+(6i^+3j^-7k^)+CHence,   C=-7i^+4k^

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