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General
Easy

Question

A flat plate of height 1m and width 1m is hinged at its middle as shown in the figure. To the left of the plate is a liquid of density rho. To prevent the rotation of the plate, a force F is applied from the other side at the bottom. The value of F is

  1. Zero    
  2. fraction numerator rho g over denominator 2 end fraction    
  3. fraction numerator rho g over denominator 4 end fraction    
  4. fraction numerator rho g over denominator 6 end fraction    

The correct answer is: fraction numerator rho g over denominator 6 end fraction

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