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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A sphere is placed rotating with its centre initially at rest in a corner as shown in Figs.(a) and (b). Coefficient of friction between all surfaces and the sphere is 1/3. Find the ratio of the friction forces fa/fb by ground in situations (a) and (b).

A sphere is placed rotating with its centre initially at rest in a corner as shown in Figs.(a) and (b). Coefficient of friction between all surfaces and the sphere is 1/3. Find the ratio of the friction forces fa/fb by ground in situations (a) and (b).

Find the minimum height of the obstacle so that the sphere can stay in equilibrium.