A weightless rod is acted upon by upward parallel forces of 4  N and 2  N magnitudes at ends A an...

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A weightless rod is acted upon by upward parallel forces of 4  N and 2  N magnitudes at ends A and B, respectively. The total length of the rod A B=3  m. To keep the rod in equilibrium a force of 6  N should act in the following manner
(a) downward at any point between A and B
(b) downward at the mid-point of A B
(c) downward at a point C such that A C=1  m
(d) downward at a point C such that B C=1  m

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