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Q.

The working principle of the spring balance is:


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a

Newton’s law of motion

b

Ohm’s law

c

Hooke’s law

d

None of the above 

answer is C.

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Detailed Solution

A spring balance is used to determine the weight of an object. When a load is hung on a spring, it stretches, and the extension of the spring is proportional to the weight of the object. Hooke's law, F = -kx, governs the operation of the spring balance. In the equation, F is the force, x is the extension in length, and k is the constant of proportionality known as the spring constant in N/m.
 
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