JEE Main 2018 Physics question

A disc rotates about its axis of symmetry in a horizontal plane at a steady rate of 3.5 revolutions per second. A coin placed at a distance of 1.25 cm from the axis of rotation remains at rest on the disc. The coefficient of friction between the coin and the disc is (g = 10m/s²)

• (A)0.5
• (B)0.7
• (C)0.3
• (D)0.6Correct