Physics Lab Equipment

LEEI-10 Electrostatic Field Mapping Apparatus

LEEI-10 Electrostatic Field Mapping Apparatus


  • Intuitive and clear configuration

  • Convenient operation

  • Stable and reliable measurements


In engineering applications, it is often needed to know the electric field distribution of an electrode system in order to study the motion behavior of the electrons or charged particles in an electric field. For example, the electric field distribution of the electrodes in an oscilloscope tube should be known for the study of electron beam focusing and deflection in the oscilloscope tubes.

In general, mathematical analysis or experimental simulation can be used to derive the distribution of an electric field. The former method is normally used for simple cases while the latter method should be used for complicate electrode systems.

Simulation method uses an easy-to-implement or easy-to-measure physical process to substitute an inconvenient-to-implement or not-easy-to-measure physical process. It requires that the two states or two sets of physical quantities in two physical processes have a one-to-one corresponding relationship, similar mathematical expressions, and similar boundary conditions. For a stable physical field, once its differential equations and boundary conditions are determined, its solution is unique. Since a steady current field has the same mathematical expressions and boundary conditions as an electrostatic field, it is used to simulate the electrostatic field.

The configuration of this experimental apparatus is intuitive and clear. A two-level structure is used for positioning in plane and point sampling in synchronous. It is convenient to operate and the measurement data is stable and reliable.

Using this apparatus, students can: 

1. Learn to study electrostatic fields using simulation method. 

2. Deepen the understanding on concepts of strength and potential of electric fields. 

3. Map the equipotential lines and electric field lines of the two electrode patterns of a coaxial cable and a pair of parallel wires.

The instruction manual contains experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.


Power supply 0 ~ 15 VDC, continuously adjustable
Digital voltmeterrange -19.99 V to 19.99 V, resolution 0.01 V
Parallel wire electrodes

Electrode diameter 15 mm

Distance between electrodes 95 mm

Coaxial electrodes

Diameter of central electrode 15 mm

Width of ring electrode 10 mm

Inner diameter of ring electrode 150 mm

Parts List

Main electric unit1
Conductive glass and carbon paper support1
Probe and needle  support1
Conductive glass plate2
Connection wire4
Carbon paper100 sheets A4 size
Coordinate paper100 sheets A4 size
Paper clamps4

Optional conductive glass plate: 

focusing electrode & non-uniform field electrode

each one
Instruction manual1 (Electronic version)


Examples of electrode patterns and corresponding electrostatic field simulations

(click figure to enlarge)

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