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Question

A block of mass 4 kg is suspended through two light spring balances A and B in series. Then A and B will be read respectively

A
4 kg and zero kg
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B
zero kg and 4 kg
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C
4 kg and 4 kg
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D
2kg and 2 kg
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Solution

The correct option is C 4 kg and 4 kg
The correct option is C

We have,

mass=4kg

So, Both the spring balance will give the same reading of 4kg

Let tension in the lower spring is T1

Considering the equlibrium of the block T1=4g(reading)

T1=4kg

Let tension in the upper spring is T2

Considering the equilibrium of the lower spring.T2 will act into the upward direction and T1in the downward direction

T2T1=0

T2T1=4g (reading)

T26=4kg

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