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Vector — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsVector1 Mark
Question
Assertion : The minimum number of non coplanar vectors whose sum can be zero, is four.
Reason : The resultant of two vectors of unequal magnitude can be zero.
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Answer

(c) The resultant of two vectors of unequal magnitude given by $R=\sqrt{A^2+B^2+2 A B \cos \theta}$ cannot be zero for any value of $\theta$.

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