Eddy current equation question

In summary, when a magnet is moved against a conductor, it creates a force called an eddy current, which opposes the movement of the magnet. The repelling force of the eddy current can be calculated, but the exact equation is not known. It is influenced by the strength of the magnet, the conductivity of the conductor, and the relative motion of the magnet and conductor. The Lenz's law and Faraday's law of mutual induction are important principles to understand in this phenomenon. The structure of the conductor also plays a role, as it can affect the flow of electrons and create a circuit through induction. To learn more about this topic, it is recommended to take an electromagnetism course.
  • #1
hover
343
0
Whenever you stroke a magnet against a plate of copper or another good conductor of electricity you always get a force that opposes the movement of a magnet called and eddy current. What i want to know is can you calculate the repeling force of the eddy current? and if so how? I know that the key to the equation must have something to do with the strength of a magnet, how well the conductor conducts and the relative motion of the magnet or copper plate.

Thanks!:biggrin:
 
Physics news on Phys.org
  • #2
Anyone? Can someone please respond?
 
  • #3
You should read about Lenz's law and Faraday's law of mutual induction
 
  • #4
i do not believe that much is known about calculating the resisting force. The faster is moves the more it induces a current which repels it more. I remember observing a good experiment a cylindrical magnet perfectly sized for an aluminium tube, it moved somewhat irregularily, sometimes it went a bit faster and other times a bit slower. But it took 10 times longer to pass through than a regular non-magnet of equivalent shape.
The structure of the metal is also important in the effect, hole in the metal will effect the flow of the electrons. in essense it creates a circuit via induction. If you want to learn more i suggest you take electromagnetism
 

1. What is the Eddy current equation?

The Eddy current equation is a mathematical formula that describes the behavior of eddy currents, which are electrical currents induced in conductors by changing magnetic fields. It takes into account factors such as the material properties of the conductor, the magnetic field strength, and the frequency of the changing field.

2. How is the Eddy current equation derived?

The Eddy current equation is derived from Faraday's law of induction, which states that a changing magnetic field will induce an electric field in a conductor. By applying Maxwell's equations, which describe the relationship between electric and magnetic fields, the Eddy current equation can be derived.

3. What is the significance of the Eddy current equation in practical applications?

The Eddy current equation is important in understanding and predicting the behavior of eddy currents in various materials and systems. It is used in the design of electrical devices such as transformers, motors, and generators, as well as in non-destructive testing methods to detect flaws or defects in metal components.

4. How does the Eddy current equation relate to energy loss?

According to the Eddy current equation, the magnitude of eddy currents is directly proportional to the frequency of the changing magnetic field. This means that higher frequencies will result in stronger eddy currents, which can lead to energy loss in the form of heat. This is an important consideration in the design and operation of electrical systems.

5. Are there any limitations to the Eddy current equation?

The Eddy current equation is based on certain assumptions, such as a uniform magnetic field and a homogeneous conductor. In practical applications, these conditions may not always be met, leading to some limitations in the accuracy of the equation. Additionally, the Eddy current equation does not take into account the effects of eddy currents on the magnetic field itself, which can be significant in some cases.

Similar threads

I How Do Eddy Current Dampers Work in Space Applications?
    • Electromagnetism
Replies
4
Views
274
B Magnetic field produced by an electric current
    • Electromagnetism
Replies
5
Views
312
Question about eddy currents ?
    • Electromagnetism
Replies
3
Views
905
Eddy Current Speedometer Experiment
    • Electromagnetism
Replies
1
Views
2K
Eddy currents, and induced current, can they both co-exist?
    • Electromagnetism
Replies
11
Views
3K
Eddy Current Brake Behavior (Accelerating From Rest)
    • Electromagnetism
Replies
3
Views
1K
Magnets & Eddy Current Drag help please
    • DIY Projects
Replies
10
Views
2K
A Question on Skin Effect and Eddy Currents
    • Electrical Engineering
Replies
6
Views
1K
I An Alternative explanation for energy loss due to Eddy currents
    • Classical Physics
Replies
2
Views
662
Qualitative explanation of Magnetic Braking
    • Electromagnetism
Replies
6
Views
1K

Hot Threads

Recent Insights

Back
Top