The principle involved in the working of a beam balance is :

principle of moments

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principle of inertia

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principle of superposition

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principle of velocity

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Solution

The correct option is A principle of moments
A beam balance works on the principle of moments according to which in equilibrium, the anti-clockwise moment due to the weight of an object on left pan of the beam is equal to the clockwise moment due to the standard weights on the right pan of the beam.

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