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Q.

As shown in the adjoined figure we pull the two spring balances that are hooked together, in opposite directions. If the reading shown by A is 1.5 N, the reading shown by B will be


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a

1.5 N

b

2.5 N

c

3.0 N

d

zero 

answer is A.

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Detailed Solution

As shown in the adjoined figure we pull the two spring balances that are hooked together, in opposite directions. If the reading shown by A is 1.5 N, the reading shown by B will be 1.5 N.
 From Newton’s third law of motion, every action force has equal and opposite reaction force. Hence, the force (action) exerted by A on B and force (reaction) exerted by B on A are equal. so the reading shown by B will be 1.5 N in both the spring balance.
 
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