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The spring balance A reads 2 kg with a b...

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

A

(a) the balance A will read more than 2 kg

B

(b) the balance B will read more than 5kg

C

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

D

(d) the balance A and B will read 2kg and 5kg respectively

Text Solution

Verified by Experts

The correct Answer is:
B, C
When the block of mass m is arranged as shown in the figure, an upthrust `F_T` will act on the mass which will decrease the reading on A.
According to Newton's third law, to each and every action, there is equal and opposite reaction.
So `F_T` will act on the liquid of the beaker which will increase the reading in B.
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Knowledge Check

  • The 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

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

  • 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 the 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?

    A
    `W_(1)ltW_(3)`
    B
    `W_(1)ltW_(3)`
    C
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    D
    `W_(2)gtW_(4)`

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    A
    Both the scales will read 5 kg
    B
    The upper scale will read 10 kg & the lower zero
    C
    Both the scales will read 10 kg
    D
    The readings may be anything but their sum will be 10 kg

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