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A uniform rod of length , specific gravity and mass is hinged at one end to the bottom of a tank of water (specific gravity = ) filled up to a height of as shown in the figure. Taking the case the force exerted by the hinge on the rod is:

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The correct answer is:
, downwards
Length of rod inside the water
Upthrust
Or
Weight of rod
For rotational equilibrium of rod, net torque about O should be zero.
Or
Or
The hinge force is
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