Magnetic field lines are imaginary lines that represent the direction and strength of a magnetic field. They are used to visualize and understand the behavior of magnetic fields.
In coil diagrams, magnetic field lines are represented by curved lines that indicate the direction of the magnetic field. The closer the lines are together, the stronger the magnetic field is in that region.
Coil diagrams are useful for understanding magnetic fields because they allow us to visualize the direction and strength of the field in a specific region. By looking at the arrangement of the coils and the direction of the field lines, we can make predictions about how the magnetic field will behave.
The direction of magnetic field lines in a coil diagram is determined by the right-hand rule. If we wrap our right hand around the coil in the direction of the current, with our thumb pointing in the direction of the current, our fingers will curl in the direction of the magnetic field lines.
No, magnetic field lines cannot cross in a coil diagram. This is because the direction of the magnetic field at any point is determined by the direction of the current in the coil, and the field lines must follow a continuous path from the north to the south pole of the coil.