In a physical balance working on the principle of moments, when 5mg 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 5mg weight is placed, load arm shifts to left side,
hence left arm becomes shorter than right arm.
Hence, option (C) is correct.