Rotational MotionMedium

Question

A sphere is placed rotating with its centre initially at rest i a corner as shown in figure (A) & (B). Coefficient of friction between all surfaces and the sphere is . Find the ratio of the frictional force by ground in situations (A) & (B)
                              

Options

A.1
B.9/10
C.10/9
D.None

Solution

In figure (a) μN1 + N2 = mg ... (i)
N1 = μN2, N2 = ∴ fa = mg

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