JEE MAIN - Physics (2017 - 8th April Morning Slot - No. 8)
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 ?
Left arm is longer than the right arm
Both the arms are of same length
Left arm is shorter than the right arm
Every object that is weighed using this balance appears lighter than its
actual weight.
설명
From principle of moment we know, the anticlockwise moment is equal to clockwise moment when a system is stable or balance.
$$\therefore\,\,\,$$ load $$ \times $$ load arm = effect $$ \times $$ effect arm
When 5 mg weight is placed on the left pan, load arm shift to left side, hence left arm become shorter than right arm.
$$\therefore\,\,\,$$ load $$ \times $$ load arm = effect $$ \times $$ effect arm
When 5 mg weight is placed on the left pan, load arm shift to left side, hence left arm become shorter than right arm.