Impending state of mation 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 influenace F sin`theta` may have a tendency to move upwart or it may be assumed that F `sin theta` justprevents downward fall of th block read the above prevents downward fall of the block .Read the above passage carefully and answer the following quesstions.
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)`
