Three identical cylinders of rough surfaces are mounted on frictionless horizontal axles passing through their centres. They are all spinning about their axles in anti – clockwise direction with same angular speed  ${\omega }_0$. They are brought closer into contact and their axels are held stationary till slipping between them ceases. [ The cylinders are held symmetrically relative to one another as shown, so that all of them touch one another] $({\omega }_0=12rad/\sec )$