# Are these instances of identical magnetic fields?

• pager48
In summary, the conversation discusses the difference between a rotating static magnetic field from permanent magnets and a current spike from a charge capacitor in an electromagnet. It is mentioned that the permanent magnet can induce eddy currents depending on its rotation, while the electromagnet is only magnetic when the capacitor discharges through it. The question of how a rotating permanent magnet can be both rotating and static is also raised.
pager48
Are both magnetic fields emanated from an electromagnet fed with a current spike from a charge capacitor and a rotating static magnetic field from permanent magnets instances of time varying fields?

The permanent magnet would be attached to perhaps some rotating disc thus passing over a target were as an electromagnet can stay over the target and is a magnet only when the capacitor discharges thru it. Does the rotating permanent magnet induce eddy currents?

How can it be rotating and static at the same time?
pager48 said:
Does the rotating permanent magnet induce eddy currents?
It depends on how it rotates, in general yes.

## 1. What is a magnetic field?

A magnetic field is a region in space where a magnetic force can be detected. It is created by the movement of electrically charged particles, such as electrons, and can be seen as lines of force that extend from one magnet to another.

## 2. How do you determine if two magnetic fields are identical?

To determine if two magnetic fields are identical, you can use a compass or a magnetic field sensor to measure the strength and direction of the field at different points. If the readings are the same at all points, the fields can be considered identical.

## 3. What factors can cause two magnetic fields to be different?

The strength and direction of a magnetic field can be affected by the distance from the source, the orientation of the source, and the presence of other magnetic fields nearby. Variations in these factors can result in two magnetic fields that are not identical.

## 4. Why is it important to determine if two magnetic fields are identical?

Identifying identical magnetic fields is important in various scientific and technological applications. For example, in the field of electromagnetism, it is crucial to know if two fields are identical in order to properly calculate their combined effect. In industries that use magnets or electromagnets, knowing if two fields are identical can ensure the efficiency and accuracy of their products.

## 5. Can two magnetic fields be completely identical?

In theory, two magnetic fields can be completely identical if they have the exact same strength and direction at all points. However, in reality, this is highly unlikely due to the many factors that can affect a magnetic field. Even small variations in these factors can result in differences between two seemingly identical fields.

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