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Impending state of motion is a critical ...

Impending state of motion is a critical border line between static and dynamic states of a body A block of mass m is supported on a rough vertical wall by applying a rough vertical wall by appying a force F as shwon in figure coefficent of static fricition between block and wall is `mu` The block under the influeance F sin`theta` may have a tendency to move upward or it may be assumed that F `sin theta` just prevents downward fall of the block read the above prevents downward fall of the block .Read the above passage carefully and answer the following questions the value of F for which friction force between the block and the wall is zero .

A

mg

B

`(mg)/(sintheta)`

C

`(mg)/(costheta)`

D

`(mg)/(tantheta)`

Text Solution

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The correct Answer is:
b
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