Overview of electrostatics and electricity
Electrostatics involves electric charges namely positive and negative charges, the forces between them which is known as electric force, the field that surrounds them, and their behavior in materials. Coulomb’s law is the simple relation that governs electrostatic interactions and the field around the charges is described using the concept of the electric field. Coulomb’s law is an inverse square law that gives the force between two charges kept at some distance (say $r$ ) apart from each other.
Like Coulomb’s law, the law of gravitation is also an inverse square law but gravitational interactions are only attractive in nature and electrical interactions are attractive as well as repulsive depending on the nature of interacting charges. Charges of the same kind repel each other and charge different kinds, i.e. one charge positive and other negatives, attract each other. One more thing electric interactions are much stronger than gravitational interactions and gravitational force is almost negligible in comparison to the forces of electric origin. This is always true when we study the interactions of atomic and subatomic particles. But when we study objects very large in size say a person, a planet, or satellites, the net governing force, in this case, is a gravitational force not electric.
Now coming to the properties of electric charges we know that electric charge is quantized and it also obeys the law of conservation means total charge remains conserved. In what we say electrostatic interactions electric charges are at rest in our frame of reference. Now think about what happens when we are at rest in our frame of reference and the charge under consideration is moving with velocity v with respect to us such a moving charge leads to the origin of magnetism which we will discuss in a later section.
Again a question is what is electricity. Electricity deals with stationary and moving electric charges, the actions of force between these charges, and the electric and magnetic fields generated by them. Electrostatics is simply electricity at rest. Electricity is the backbone of the modern society in which we use various instruments which depend on electric current for their functioning and without it, we would not have telephones, television, household appliances and many more gadgets which are now part of our daily life. In electricity, we study the motion of electric charges, or electric currents, and also the voltages that produce currents and the ways to control currents.
We have learned about what electrostatics is and what we study in it. Now we will discuss why we study electrostatics and where it finds its applications. Electric interactions are of immense importance in chemistry and biology and have many technological applications. Concepts of electricity proved to be of basic importance for studying atomic physics, nuclear physics, and solid-state physics. It also finds importance in studying advanced-level physics.
Electrostatics Study Material
- Electric Charge Concept :
In this article learn about the electric charge concept along with the unit, basic properties, origin, and methods of charging.
- Charging by friction: Learn about what is charging by friction.
- MCQ On Electrostatics: In this article find few multiple choice questions on electrostatics.
- How is coulomb’s law similar to newton’s law of gravitation? How is it different?: Explains the difference and similarities between these two action at a distance forces. Take a short quiz at the end of the article to check if you have understood the concept.
- Coulomb’s law quiz : In this online quiz find some MCQs and true/False type questions which you can attempt to check your understanding of this concept.
- What do electric forces between charges depend on? We all know that electric charges exert forces on each other. Learn about the factors on which these forces depend on.
- Which symbol and unit of measurement are used for voltage?
- Comparison between Coulomb’s law and Biot Savart law
- Which molecule is an example of a common electrical dipole?
- How to Calculate Electric Field from Potential?
- How to find the magnitude of an electric field?
- How to draw electric field lines?