As shown in the figure, two equal masses each of 4 kg are suspended from a spring balance. The reading of the spring balance will be
The spring balance A reads 2kg with a block m suspended from it. A balance B reads 5 kg when a beaker with liquid is put on the pan of the balance. The two balances are now so arranged that the hanging mass is inside the liquid in the beaker as shown in the figure in this situation: