Given, $\hat{i},$ $\hat{j}$ and $\hat{k}$ are unit vectors along x, y and z-axis respectively. Then, \[\hat{i}.(\hat{j}×\hat{k})=\hat{i}.(-\hat{i}) \;\;\; [\because \hat{k}×\hat{j}=-\hat{i}]\] \[=-1 \;\;\; [\because\hat{i}.\hat{i}=1]\]

If a vector B is added to A, under what condition does the resultant vector have a magnitude equal to A+B?