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
• B. zero kg and 4 kg
• C. 4 kg and 4 kg
• D. 2kg and 2 kg

Answer 1

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 $T_1$

Considering the equlibrium of the block $T_1=4g$(reading)

$T_1=4kg$

Let tension in the upper spring is $T_2$

Considering the equilibrium of the lower spring.$T_2$ will act into the upward direction and $T_1$in the downward direction

$T_2-T_1=0$

$T_2-T_1=4g$ (reading)

$\frac{T_2}{6}=4kg$