Jõujoon

Jõujoon is an Estonian term that translates to "force line" or "line of force." It is a concept primarily used in physics and engineering to visualize the direction and magnitude of forces. These lines are typically drawn to represent fields of force, such as magnetic fields or electric fields. The direction of the force line at any given point indicates the direction of the force acting on a test particle or charge at that location. The density of the force lines, meaning how close together they are, represents the strength of the force. Where the lines are closer, the force is stronger, and where they are farther apart, the force is weaker.

In the context of magnetic fields, jõujooned emerge from the north pole of a magnet and enter the south pole, forming closed loops. For electric fields, they originate from positive charges and terminate on negative charges, or extend to infinity if only one type of charge is present. The concept of jõujooned is a graphical tool that simplifies the understanding and analysis of invisible forces. They are not physical entities but rather representational aids that help in predicting the behavior of charged particles or magnetic materials within a field. The concept is fundamental in understanding electromagnetism and electrostatics.