Introduction:
In order to understand why positive charges repel each other and positive and negative charges attract, it is necessary to delve into the nature of electric charges and the fundamental principles of electrostatics.

Electric Charges:
Electric charges are fundamental properties of matter. There are two types of charges: positive and negative. Like charges repel each other, while opposite charges attract each other. This behavior can be explained by the concept of electric fields and the behavior of charged particles within these fields.

Electric Fields:
An electric field is a region surrounding an electric charge where it exerts a force on other charged particles. The strength and direction of the electric field depends on the magnitude and sign of the charge creating it.

Like Charges Repel:
When two positively charged particles are brought close to each other, they both create electric fields that interact with each other. These electric fields push against each other, resulting in a repulsive force between the particles. This repulsion is due to the fact that the electric fields of both particles have the same direction and therefore exert a force in the same direction. As a result, the particles move away from each other.

Opposite Charges Attract:
On the other hand, when a positively charged particle is brought close to a negatively charged particle, their electric fields interact in a way that causes an attractive force between them. The electric field lines of the positive charge point towards the negative charge, while the electric field lines of the negative charge point away from it. Consequently, the electric fields exert forces towards each other, leading to the particles being pulled together.

Conclusion:
In summary, positive charges repel each other because their electric fields interact in a way that creates a repulsive force. Positive and negative charges attract each other because their electric fields interact in a way that creates an attractive force. These behaviors are fundamental to the nature of electric charges and can be explained through the concept of electric fields and the interactions between charged particles.

Because positive charge is deficient of electrons and negative is having efficient number of electrons