A sphere is rotating between two rough inclined walls as shown in figure. Coefficient of friction between each wall and the sphere is 1/3. If f 1 and f 2 be the frictional forces at P and Q. Then 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
be the friction coefficient between sphere and each wall. Free body diagram of sphere is
Net force on the sphere in horizontal diarection is zero.
Substituting 
we get,
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