Radius of the wire is given by r and 2r.
The breaking force of wire is given by,
F = σA
σ is the breaking stress (constant of material) and A is the area of cross section.
Let F1 and F2 be the breaking force for wires respectively.
Hence the breaking force required to break the thick wire is four times the thin wire.
Inter-atomic or inter-molecular forces are electrostatic in nature.
Adhesive force is the attractive force between two unlike molecules. They are caused by forces acting between two substances like electrostatic force (attraction due to opposing charges), mechanical force etc.
E.g., Force of attraction between gum and paper.