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If a^ and b^ are unit vectors and if a^×b^=3a^b^, then the magnitude of the vector (a^  b^)  is 

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detailed solution

Correct option is B

In the data, a^×b^=sinθ and a^⋅b^=cosθ. Using these gives θ = 60o.a^−b^=12+12−2×1×1×cos60o


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