A spring balance, A reads 2 kg with a block m suspended from it. A balance B reads 5 kg when a beaker filled 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 as shown in figure. In this situation

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the balance A will read more than 2 kg

the balance A will read less than 2 kg and B will read more than 5 kg

the balance A and B will read 2 kg and 5 kg

the balance B will read more than 5 kg

answer is C.

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Detailed Solution

The reading of balance A will decrease due to the upward thrust caused by buoyancy. The upthrust will be equal to the weight of water displaced. The net downward force due to mass immersed in water will add to effective weight of the system. So, the reading of balance B will increase.

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