PhysicsChapter 6: Electrostatics
Electric Field
Introduction
An electric field is a region in which a charged object experiences an electric force. Electric field lines help us represent the field.
Definition
Direction
The direction of the electric field at a point is the direction of force on a small **positive test charge*. Field lines: leave positive charges; * enter negative charges.
Properties
Electric field lines: * never cross; are closer together where the field is stronger; show field direction by arrows.
Uniform Field
A uniform electric field can be represented by straight, parallel, equally spaced field lines. A good approximate example exists between large oppositely charged parallel plates away from the edges.
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FIELD DIRECTION
- Positive test charge
+
- Lines out
−
- Lines in