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  • Shown in the figure is rigid and uniform one meter long rob AB held in horizontal position by two strings tried to its ends and attac

Shown in the figure is rigid and uniform one meter long rob AB held in horizontal position by two strings tried to its ends and attached to the ceiling. The rod is of mass 'm' and has another weight of mass 2 m hung at a distance of  75 cm from A. The tension in the string at A is :
Option: 1 0.5 mg
Option: 2 2 mg
Option: 3 0.75 mg
Option: 4 1 mg

Answers (1)

best_answer

As shown in the figure

The tension in the string at A is T

So

\begin{aligned} &\text {As Net torque about } B=0\\ &\Rightarrow T \times 100=m g \times 50+2 m g \times 25\\ &\Rightarrow T=m g \end{aligned}

Posted by

avinash.dongre

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