# Power loss due to ionisation of air from magnetic fields

• CraigH
In summary, the presence of a magnetic field created by a current carrying wire typically does not cause power loss unless there is a changing flux nearby that induces an emf. However, if the magnetic field is strong enough to ionize the air, this can result in power loss. In high voltage systems, this is known as corona and can cause various issues. The design of these systems aims to minimize corona development.
CraigH
Hi,
A current carrying wire creates a magnetic field around it, as shown here: http://courses.ae.utexas.edu/ase463q/design_pages/fall02/wavelet/3_sour8.gif

As far as I am aware this usually doesn’t cause a power loss. Even if there is a flux on a nearby conductor there will be no power loss along the wire unless that flux is changing, in which case a emf will be induced on that conductor, meaning there has to be a power loss on the first wire. Correct?

However, if a wire has a current that causes a magnetic field so strong it ionises the air around it, surely this will cause a power loss? as work has been done ionising the atoms.

Also, if a different magnet is put into the magnetic field caused by the wire, it will feel a force on it, and accelerate in the direction of the force, so work is being done here as well.

What I'm basically trying to ask is that if there is a current carrying wire with zero resistance, will it still have loss's due to the fact that it creates a magnetic field?

Thanks

Last edited by a moderator:
It is the Electric Filed (high voltage) that typically ionizes the air, and this does yield some looses in high voltage systems. I have not heard of a magnetic field causing ionization.

In high voltage systems this un-wanted ionization is called corona - and leads to a lot of problems, so the mechanical design of the systems tries to minimize the development of the corona.

## 1. What is power loss due to ionisation of air from magnetic fields?

Power loss due to ionisation of air from magnetic fields is a phenomenon in which the magnetic fields from electrical devices or power lines cause the air to become ionized, leading to energy loss in the form of heat. This can result in decreased efficiency and increased costs for energy production and transmission.

## 2. How does ionisation of air from magnetic fields occur?

When an electrical current flows through a wire, it creates a magnetic field around the wire. If the current is high enough, this magnetic field can cause the air molecules around it to become ionized, meaning that they gain or lose electrons. This ionization process results in energy loss in the form of heat.

## 3. What are the effects of power loss due to ionisation of air from magnetic fields?

The effects of power loss due to ionisation of air from magnetic fields can include increased energy costs, decreased efficiency of electrical devices, and potential damage to electrical equipment. It can also lead to electromagnetic interference, which can disrupt the functioning of nearby electronic devices.

## 4. How can power loss due to ionisation of air from magnetic fields be reduced?

There are several ways to reduce power loss due to ionisation of air from magnetic fields. One method is to use materials with low electrical conductivity, such as aluminum or steel, to shield the magnetic fields. Another approach is to use insulating materials to separate the magnetic fields from the surrounding air. Additionally, proper grounding and shielding of electrical devices can help reduce the effects of ionization.

## 5. What are some real-world examples of power loss due to ionisation of air from magnetic fields?

Power loss due to ionisation of air from magnetic fields can occur in a variety of everyday situations, such as power lines and transformers, electric motors, and household appliances. It can also be a concern in high-voltage power transmission systems, where the larger magnetic fields can cause significant energy loss. The effects of ionisation can also be seen in the form of static electricity, which can be felt when touching certain objects or surfaces.

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