The vectors i, j and k each have magnitude:
AZero
BNine
CFour
DOne
Answer & Solution
Correct answer: D. One
1. They mark the three coordinate directions.
2. Each is used purely to give direction.
3. Each has magnitude 1.
4. So the answer is one.
_Source: NCERT Class 12 Mathematics, Ch 10 'Vector Algebra'_
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