Physics › Section M · Electric charge and field › Topic M.4
Electric field and field lines
A charge changes the space around it, so that any other charge placed there feels a force. That changed space is the electric field. Knowing the field lets you find the force on any charge at once, and field lines turn it into a picture you can read at a glance.
In this topic
- Force at a distance
- Defining the electric field
- The field of a point charge
- Worked example: a field and the force it exerts
- Adding fields from several charges
- Worked example: midway between opposite charges
- Worked example: where the field is zero
- Field lines
- Reading field-line patterns
- Common mistakes to avoid
- Key takeaways
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