A cube of mass m is placed on top of a wedge of mass 2m, as shown in figure. There is no friction between the cube and the wedge. The minimum co-efficient of friction between the wedge and the horizontal surface, so that the wedge does not move is
A
0.1
B
0.2
C
0.3
D
Text Solution
Verified by ExpertsThe correct answer is:
B
0.2
The normal reaction between the wedge and the block is
N ’ = mg cos 
So, the net horizontal force on the wedge is
F = mg cos 
sin 
The normal reaction between the wedge and the ground is
N = 2 mg + mgcos 2 
N = 2mg + mgcos 2 
Now, F = 
N gives
For 
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