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  4. In the figure shown, a cubical block is held stationary against a rough wall by applying force ' F , then incorrect statement among the following is

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Q. In the figure shown, a cubical block is held stationary against a rough wall by applying force ' $F$ ", then incorrect statement among the following isPhysics Question Image

ManipalManipal 2014

Solution:

For equilibrium, $f=M g$
$F=N$
For rotational equilibrium normal will shift downward.
image
Hence torque due to friction about centre of mass = Torque due to normal reaction about centre of mass.