Why must electrostatic field be always r due to a point charge q?
Answers
Coulomb's Law describes forces acting at a distance between two charges. We can reformulate the problem by breaking it into two distinct steps, using the concept of an electric field.
Think of one charge as producing an electric field everywhere in space.
The force on another charge introduced into the electric field of the first, is caused by the electric field at the location of the introduced charge.
The electric field is normalized electric force. Electric field is the force experienced by a test charge that has a value of +1+1plus, 1.
One way to visualize the electric field (this is my mental model): imagined small positive test charge glued to the end of an imaginary stick. (Be sure your imaginary stick doesn't conduct, like wood or plastic). Explore the electric field by holding your test charge in various locations. The test charge will be pushed or pulled by the surrounding charge. The force the test charge experiences (both magnitude and direction), divided by the value of the small test charge, is the electric field vector at that location. Even if you take away the test charge, there is still an electric field at that location.
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