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**Field Theory**

In physics, we study two types of field theory

- Classical field theory
- Quantum field Theory

**Electric Field theory**

Let at the point charge is q without distributing any other charge that is produce by field. If the charge is q over the force F then the electric filed at the point is

E = F/q

Electric field at a point is a vector quantity. Let Electric field E1 at the point due to charge Q1 and electric field E2 at the same point due to charge Q2. Then the resultant field when both Charges Q1 and Q2 are present:

E = E1+ E2

Please note that E, E1 and E2 are vector quantity.

Electric filed due to a point charge is calculated by the following formula:

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