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 :

200 N

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100 N

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400 N

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Zero

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Solution

The correct option is B 100 N
If a force is applied to the weighing end of the spring balance, and no force is applied to the other and, the spring balance will accelerate in the direction of the applied force. To measure a force on a spring balance, an equal and opposite force must always be applied to the other end. If the spring balance is hang from a fixed point, the necessary force is transmitted through the spring balance.
When a stretching force of $100$ N is measured or a spring same force is applied on opposite end.
Hence the reading on spring balance is $100$ N

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