When designing the shape of electrode, it is necessary to enlarge or reduce the electrode according to the shape, size and distribution of charged body in electrical equipment.

Electrostatic field is a special substance around electrostatic charge. When studying the electrostatic field and the motion law of electrons in the electrostatic field, it is often necessary to know the electric field distribution in the space around the charged body. Because there is no charge movement in the electrostatic field, the magnetoelectric instrument with current indication can't measure directly.

Extended data:

Precautions:

In order to connect and adjust the voltage or current of a certain part of the circuit from zero, only the voltage divider circuit can satisfy it.

If the range of voltmeter and ammeter provided in the experiment or the maximum allowable current of resistance element is very small, the actual current (voltage) in the circuit will exceed the range of ammeter or the maximum allowable current (voltage) of resistance element no matter how it is adjusted. In order to protect ammeter or resistance element from damage, voltage dividing connection circuit must be adopted.

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