Question

A body of mass M is kept on a rough horizontal surface (friction coefficient =μ). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on A is F, where
(a) F = Mg (b) F = μ Mg (c) Mg≤ F≤ Mg √(1+μ²) (d) Mg≥  F ≥ Mg √(1-μ²) 

Answer 1

(c) Mg≤ F≤ Mg √(1+μ²)