The model used in circuit theory for a device will depend on which of these are strong
and which are negligible.
Electrostatic field will be present in all devices in an electrical system and cannot be
ignored in any device. Electrostatic field inside any device is a function of charge distribu-
tions on all devices in the system. However, if the physical dimensions of the devices are
small compared to spatial distance between the devices, then, the electrostatic field inside
a particular device is determined uniquely by the charge distribution on its surface alone.
Then, there exists a unique ratio between the electrostatic potential difference across ...
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