What is the minimum number of unequal magnitude vectors required to get a null vector?
Correct answer: C. Three
- A. Zero
- B. Two
- C. Three
- D. None
Explanation
Two unequal vectors cannot have a zero resultant because their magnitudes would have to be equal and opposite. Three unequal vectors can form a closed triangle, so their vector sum can be zero. Students often choose two by focusing on opposite directions but overlooking the requirement of equal magnitudes.
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About Addition of Vectors
Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.
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