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Question

Calculate Moment of force F1 about O.

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A
10N m (clockwise)
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B
10N m (anti clockwise)
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C
15N m (clockwise)
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D
15N m (anticlockwise)
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Solution

The correct option is B 10N m (anti clockwise)
As we have to find the moment of force about O with respect to first force for which the perpendicular distance is 2m. We have a magnitude of force 5N. We know that moment of force given by formula r×F=2×5 Nm.
Hence there is a magnitude of 10Nm moment of force.
If the fingers of the right hand are curled from the direction of r towards the direction of F then the thumb points the direction of torque. Hence it is anti-clockwise in direction with 10Nm.

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