What should be added in vector a = 3i + 4j - 2k to get its result… - Vidyadip

MCQ

What should be added in vector $a = 3i + 4j - 2k$ to get its resultant a unit vector $ i$

✓
$ - \,2i - 4j + 2k$
B
$ - 2i + 4j - 2k$
C
$2i + 4j - 2k$
D
None of these

✓

Answer

Correct option: A.

$ - \,2i - 4j + 2k$

a
(a) Let $b$ should be added, then $a + b = i$

$ \Rightarrow b = i - a = i - (3i + 4j - 2k) = - 2i - 4j + 2k.$

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