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Question

The spring balance A reads 2 kg with a block m suspended from it. Another 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

A
The balance A will read more than 2 kg
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B
The balance B will read less than 5 kg
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C
The balance A will read less than 2 kg and B will read more than 5 kg
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D
The balances A and B will read 2 kg and 5 kg respectively
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Solution

The correct option is C The balance A will read less than 2 kg and B will read more than 5 kg
There is a force of upthrust on mass m shown in figure. So A weighs less than 2 kg on spring balance. Balance below will show sum of load of beaker and reaction of upthrust. So, it reads more than 5 kg.

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