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Chemistry is a branch of physical science which studies the composition, structure, properties and change of matter. Chemistry deals with topics like properties of individual atoms, how atoms form chemical bonds to create chemical compounds, the interactions of substances through inter-molecular forces that give matter its general properties and the interactions between substances via chemical reactions to form different substances.
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Let us take a positive charge A. It is kept at some distance from another positive charge B. Then lines of force of A on B and lines of force of B on A will be such that they repel each other. Its reverse happens in case of unlike charges in which lines of force of the two charges make them to attract each other.