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By torque balancing about B, find the relation between NA and NB.

1. NA = W (d − x)
2. NA = W (x − d)
3. NA = W (d + x)
4. NA = W (x + d)

Correct answer: NA = W (d − x)

Solution

To balance torque about point B, the clockwise and counterclockwise torques must be equal. Using the lever arm principle, the relation NA = W (d − x) is derived.

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