Inner and outer radii of a spool are r And R respectively. A thread is wound over ita ineer surface and placed over a rough horizontal surface. Thread is pulled by a force F as shown in the figure. Then in case of pure rolling.
A. thread unwinds, spool rotates anticlockwise and friction leftwards
B. thread winds, spool rotates clockwise and friction leftwards
C. thread winds, spool moves to the right and friction acts rightwards
D. thread winds, spool moves to the right and friction does not come into existence
