Two electrons will tend to repel each other because both have a negative electrical charge. Two protons will also tend to repel each other because they both have a positive charge. On the other hand, electrons and protons will be attracted to each other because of their unlike charges.

A charged body has an electric field around it.The ability of an electric charge to attract or repel other charge is a physical force. To show these force ,lines of forces are used.When two like charges interacts the lines of forces are in opposite direction Hence they experience a repulsive interaction. When unlike charges interacts the field line or line of forces combines or field line have a mutual interaction and have attractive interaction between them.

Why Similar Charges Repel Each Other

When two charges have the same polarity, either positive or negative, they will repel each other due to the fundamental nature of electric charges. This repulsion is explained by the concept of electric fields and the behavior of charged particles within these fields.

Electric Fields
- Electric fields are regions in space where electric forces act on charged particles.
- When a charged particle is placed in an electric field created by another charged particle, it experiences a force due to the interaction between the two charges.

Force Between Similar Charges
- Similar charges repel each other because they create electric fields that oppose each other.
- Let's consider two positive charges. Each charge creates an electric field around it, and these fields interact with each other.
- The electric field lines coming out of the first charge point away from it, while the electric field lines coming out of the second charge also point away from it.
- Since the electric fields created by these charges point in the same direction, the charges experience a repulsive force pushing them apart.

Why Opposite Charges Attract Each Other

When two charges have opposite polarities, one positive and the other negative, they will attract each other. This attraction is also explained by the concept of electric fields and the behavior of charged particles within these fields.

Force Between Opposite Charges
- Opposite charges attract each other because they create electric fields that combine and reinforce each other.
- Let's consider a positive charge and a negative charge. Each charge creates an electric field around it, and these fields interact with each other.
- The electric field lines coming out of the positive charge point away from it, while the electric field lines coming out of the negative charge point toward it.
- Since the electric fields created by these charges point in opposite directions, the charges experience an attractive force pulling them together.

Conclusion
In summary, similar charges repel each other because their electric fields oppose each other, while opposite charges attract each other because their electric fields combine and reinforce each other. These behaviors are a result of the fundamental nature of electric charges and the interactions between them within electric fields.