Uniform Electric Fields
Uniform Electric Fields
- Two large parallel plates produce an approximately uniform field in the central region between them.
What uniform means
Definition
2 marksWhat is meant by a uniform electric field?
Model answer: A field with the same electric field strength and direction at every point.
- The field lines are straight, parallel and evenly spaced. Near the edges they curve, so the simple uniform model is used away from the edges.
- Potential changes at a constant rate with distance. A potential–distance graph is therefore a straight line.
Symbols
- = uniform electric field strength (V m⁻¹)
- = potential difference between the plates (V)
- = plate separation (m)
One volt per metre is equal to one newton per coulomb.
Your turnquick check
Parallel plates have a potential difference of 12 kV and a separation of 4.0 cm. Find the uniform field strength.
Show worked answer
Answer