A physical quantity qualifies as a vector only if it satisfies which of the following conditions from the notes?
AIt must have magnitude only
BIt must obey the law of parallelogram addition and have a specified direction
CIt must always act in three dimensions
DIt must be independent of the coordinate system
Answer & Solution
Correct answer: B. It must obey the law of parallelogram addition and have a specified direction
The notes state that a vector must have a specified direction, obey the law of parallelogram addition, and its addition must be commutative. Option B captures the defining conditions, while A describes a scalar.
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