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Unit vector along the vector i + j + k is
Ai + j + k
B(1/3)(i + j + k)
C(1/√3)(i + j + k)
Di + j
Answer & Solution
Correct answer: C. (1/√3)(i + j + k)
1. A unit vector is obtained by dividing a vector by its magnitude.
2. |i + j + k| = √(1²+1²+1²) = √3.
3. Hence the unit vector is (1/√3)(i + j + k).
_Source: Maharashtra Balbharati Std XII Mathematics Part 1, Ch 5 "Vectors" §5.3_
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