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Minimum number of coplanar vectors of unequal magnitude whose vector sum could be zero, is :

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answer is B.

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Detailed Solution

If there are two coplanar vectors of unequal magnitude then there resultant can never be zero.

If there are three coplanar vectors of unequal magnitude, then they may form a triangle. In this case , the resultant can be zero.

So, we need atleast three coplanar vectors with unequal magnitude whose resultant (vector sum) can be zero.

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