"Current on a perfectly conducting plane" refers to the flow of electric charge on a surface that has no resistance to the movement of electrons. This means that the current is not hindered or slowed down by the material of the surface, allowing it to flow freely.
The main difference is that a perfectly conducting plane has zero resistance, while a regular conductor has some amount of resistance. This means that current on a perfectly conducting plane will not experience any loss of energy, while current on a regular conductor will experience some loss due to resistance.
On a perfectly conducting plane, the current is directly proportional to the applied voltage. This means that if the voltage is doubled, the current will also double. This relationship is known as Ohm's law and holds true for any material with zero resistance.
No, current on a perfectly conducting plane is not affected by external magnetic fields. This is because the electrons are able to freely move without any resistance, so they are not deflected by the magnetic field. This property is important in applications such as superconductors.
Some examples include superconducting materials, such as certain metals and alloys, which have zero resistance at very low temperatures. This allows for efficient transmission of electricity in power lines and can also be used in sensitive electronic devices, such as MRI machines and particle accelerators.