The working principle of spring balance is :

Newton's laws of motion

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Hooke's law

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Ohm's law

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None of the above

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Solution

The correct option is B Hooke's law
Spring balance is used to measure the weight of the object. When a load is hung on the spring, it stretches and the spring's extension is proportional to the weight of the object. The working principle of the spring balance is Hooke's law which is $F = - k x$ .

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