If , then the value of…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

|\mathbf{a}\times\mathbf{b}|=\sqrt{3}\,\mathbf{a}\cdot\mathbf{b}

, then the value of

|\mathbf{a}+\mathbf{b}|

is: (1)

(A^2+B^2+AB)^{1/2}

(2)

\left(A^2+B^2+\frac{AB}{\sqrt{3}}\right)^{1/2}

(3)

A+B

(4)

(A^2+B^2+\sqrt{3}AB)^{1/2}