question_answer

A block of mass 10 kg is suspended through two light spring balances as  shown in figure    

A) both the scales will read 10 kg                 

B)  both the scales will read 5 kg                    

C)  the upper scale will read 10 kg and the lower zero

D)  the readings may be anything but their sum will be 10 kg

Correct Answer: A

Solution :

The FED of the spring balances and the block are as shown in figure. \[{{T}_{1}}=10g\] \[{{T}_{1}}={{T}_{2}}\] \[\Rightarrow \] \[{{T}_{2}}=10g\] where, \[{{T}_{1}}\] and \[{{T}_{2}}\]are readings of spring balances as shown in figure.