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Friction and Vertical Circular Motion Problems

The centre of...

Question

The centre of an equilateral triangle is O. Three forces F1,F2 and F3 are appointed along AB, BC and AC respectively. The magnitude of F3 so that the total torque about O should be zero is

A

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B

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C

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D

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Solution

The correct option is A

Net torque about 'O' is zero. Torque in anti-clock wise
Direction = Torque in clock wise direction $\Rightarrow \to τ F_{2} + \to τ F_{1} = \to τ F_{3}$
$\Rightarrow F_{2} + F_{1} = F_{3}$

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