Question

What is repulsion force?

Answer 1

Hint: Since we are given a very basic question, one could begin with giving a brief definition. Then you could give examples for repulsion force under various topics that you know. For example, you could explain it for the case of electrostatics as well as dynamics and also for magnetism, etc.

Complete answer:
In the question, we are asked to explain what repulsion force is. Any force that causes two objects to repel each other is repulsion force. This concept of repulsive force varies when discussed under different topics. But at the core, we have to understand that one thing is repelling another.
Let us discuss repulsion force under electrostatics. We have charges which can either be positive or negative. The force acting between like charges is repulsive force. That is two positive charges repel each other and so do two negative charges.
Now under the concept of magnetism, repulsion can happen between two magnetic dipoles. The north pole of a bar magnet repels the north pole of another magnet. Similarly for the south pole.
Also, two wires carrying current in opposite directions repel each other and so do the current loops kept on top of each other with current in opposite directions.
Also, we have sides of bodies repelling each other in a compressed material.

Note:
Nature is known for its symmetry. So, here comes the symmetric force of repulsion that is an attractive force. Here just opposite to repulsion two objects attract each other. For every example discussed in the solution, there is an attractive side. For the discussion on the current loop, if they are side by side current direction should be the same to repel each other.