In the diagram shown, friction is presen...

In the diagram shown, friction is present only between therod and the wall. The mass of the rod is M and tht of the wedge is 3M. What is the minimum value of the coefficient of friction between the rod and the wall so that rod remains in the state of rest?

0.4 `tan theta`

`tan theta`

`0.4 cot theta`

it is not possible for the rod to be in state of rest

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