Question

force between dipole is directly proportional to r or 1/r​

Answer 1

The electric dipole consists of two equal and opposite separated charges. Such charge configurations are common in molecules. For eg, in the hydrogen chloride molecule, the hydrogen part is positively charged while the chloride part is negative. Associated with a neutral atom or molecule we can define an electric dipole moment. It is simply the product of the charge and the separation between the charges. It is denoted by
→
p
. The direction is conventionally taken from the negative to the positive.