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Question

In a physical balance working on the principle of moments, when 5 mg weight is placed on the left pan, the beam becomes horizontal. Both the empty pans of the balance are of equal mass. Which of the following statements is correct?

A
Left arm is longer than the right arm
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B
Left arm is shorter than the right arm
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C
Every object that is weighed using this balance appears lighter than its actual weight.
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D
Both the arms are of same length
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Solution

The correct option is B Left arm is shorter than the right arm
According to principle of moments when a system is stable or balance, the anti-clockwise moment is equal to
clockwise moment.
i.e., load × load arm = effort × effort arm
When 5 mg weight is placed, load arm shifts to left side,
hence left arm becomes shorter than right arm.
Hence, option (C) is correct.

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