A block of mass M is held against a roug...

A block of mass M is held against a rough vertical wall by pressing it with a finger. If the coefficient of friction between the block and the wall is `mu` and the acceleration due lo gravity is g, what is the minimum force required to be applied by the finger to hold the block against the wall?

`Mg/mu`

`muMg`

`Mg/(mu+1)`

`(mu+1)Mg`

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