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Question
Shown in the figure is a rigid and uniform one meter long rod AB held in horizontal position by two strings tied to its ends and attached to the ceiling. The rod is of mass m and has another weight of mass 2m hung at a distance of 75 cm from A. The tension in the string at A is :
Shown in the figure is a rigid and uniform one meter long rod AB held in horizontal position by two strings tied to its ends and attached to the ceiling. The rod is of mass m and has another weight of mass 2m hung at a distance of 75 cm from A. The tension in the string at A is :
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Solution
The correct option is D 1mg
Net torque, τnet about B is zero at equilibrium,
⇒(TA×100)−(mg×50)−(2mg×25)=0
⇒TA×100=100mg
Therefore, Tension in the string at A
TA=1mg
Hence, option (D) is correct.
Net torque, τnet about B is zero at equilibrium,
⇒(TA×100)−(mg×50)−(2mg×25)=0
⇒TA×100=100mg
Therefore, Tension in the string at A
TA=1mg
Hence, option (D) is correct.
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