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Q.

A stretching force of 100 N is applied at one end of a spring balance and an equal stretching force is applied at the other end at the same time. The reading on the balance will be


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a

200 N

b

100 N

c

400 N

d

Zero 

answer is B.

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Detailed Solution

A stretching force of 100 N is applied at one end of a spring balance and an equal stretching force is applied at the other end at the same time. The reading on the balance will be 100 N.
Given,
Stretching force F=100 N
On a spring balance, when an equal force is applied on both ends, the balance shows the magnitude of the force applied on one end. So, the spring balance will show a reading of 100 N. If the force is applied only on one end, then the spring balance will accelerate in the direction in which the force is applied.
 
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