JEE Main 2024 Physics question
A coin is placed on a disc. The coefficient of friction between the coin and the disc is μ. If the distance of the coin from the centre of the disc is r, the maximum angular velocity which can be given to the disc, so that the coin does not slip away, is:
Answer: (A)
Solution
The friction must supply the centripetal force: mω²r ≤ μmg, so ω ≤ √(μg/r).