A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will________?
Aremain horizontal
Bslant down towards direction of pull
Cnone of the above
Dunpredictable
Eslant up towards direction of pull
Correct answer
B. slant down towards direction of pull
Explanation
The correct answer is slant down towards direction of pull.