Physics - NLM Question with Solution | TestHub

On the left pan the pulley carries masses $m$ and $2m$; the moving system pulls the arm down with less than $3mg$ the tension arrangement gives
$$2T=\frac{8}{3}mg.$$
The right arm carries a dead load $3m$.
Since
$$\frac{8}{3}mg<3mg$$
the right arm moves down.
Option B.