A spring balance reads $W_1$when a ball is suspended from it. A weighing machine reads $W_2$when a tank of liquid is kept on it. When he ball is immersed in the liquid, the spring balance reads $W_{3 }$and the weighing machine reads $W_4$. Then which of the following are not correct ?

$W_1, W_3$ are forces exerted by the ball and the spring balance on each other before and after immersion. $W_2, W_{4 }$are the forces exerted by the tank and weighing machine on each other before and after immersion of ball.

Let m = mass of ball and M = mass of tank.
N = force of interaction between ball and liquid in the tank.

${\mathrm{W}}_1=\mathrm{mg},{\mathrm{W}}_2=\mathrm{Mg},{\mathrm{W}}_3=\mathrm{mg}-{\mathrm{F}}_{\mathrm{B}},{\mathrm{W}}_4=\mathrm{Mg}+{\mathrm{F}}_{\mathrm{B}}$

We cannot establish any relation between $W_3 and W_4$