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Electric field lines
Beginner
Lines begin on positive and end on negative charges.
efieldLines start on positive charges and end on negative ones, tangent to the field direction, and denser lines mean a stronger field. They never cross.
A dipole shows curved lines between the charges.
Field lines are a visual device, not physical objects.
In more detail
Electric field lines show the direction of the field, starting on positive charges and ending on negative ones. The density of lines shows the field strength, and lines never cross.
Real-world uses
- Engineers sketch field lines to design high-voltage equipment.
- Field line maps help understand electrostatic shielding.
- Engineers and students draw field lines to see the direction of forces in a circuit or a capacitor.
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Frequently asked questions
Do field lines exist physically?
No, they are a visual tool to represent the field.
Why don't field lines cross?
Because the field has only one direction at each point.
Do field lines ever cross?
No. Field lines show a single direction at each point, so two lines cannot cross at the same place.
Related topics in Electrostatics
Superposition of forces · Electric field · Field of a point charge · Electric dipole · Field of a dipole · Torque on a dipole in a field