Question

For any two vectors $\vec{A}\ and\ \vec{B},\ if\ \vec{A}.\vec{B}=|\vec{A}\ \times\ \vec{B}|$, the magnitude of $\vec{C} = \vec{A} + \vec{B}$ is
(a) A + B
(b) $\sqrt{A^{2}+B^{2}+\sqrt{2}AB}$
(c) $\sqrt{A^{2}+B^{2}}$
(d) v$\sqrt{A^{2}+B^{2}+\frac{AB}{\sqrt{2}}}$

Answer 1

(d) ...........................