A force is applied perpendicular to the edge of a cube of side length 'a' as shown in the diagram. and respectively is
The torque about edge
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The perpendicular distance from the point of rotation when cross producted with Force given us Torque
So τ S u r f a c e = F × r .
Now In these case Angle between r and F is 9 0 o
SO τ C D = F × 0 = 0
And τ A B = F × a = F a where a is the edge of the cube