A wire loaded by weight of density 7800 kg/m3 is stretched to length of 1m. On immersing the weight in liquid of density 1300kg/m3, the length shortens by 6mm. Find the original length of the wire.
Density of the load, ρ = 7800 kg/m3
Length of the wire, l = 1 m
Density of liquid, = 1300 kg/m3
Let, V be the volume of weight suspended from the wire.
Therefore, tension in the wire when load is in the air is equal to,
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.