Eddy currents and the motion of the body

In summary: So, it will go past the magnet, overshoot downwards, then upwards and so on.In summary, when a solid metallic body is moved closer to a magnet, it experiences an increase in magnetic flux which generates eddy currents. The question arises whether the body will return to its original position or remain near the magnet. It is argued that the generation of heat from the eddy currents will cause the body to stop near the magnet. However, if the energy is not lost as heat, the eddy currents will produce a magnetic force to oppose the motion and attempt to make the flux linked with it equal to the initial flux. Lenz's law states that the opposing force would be equal to the force pushing the object towards the magnet.
  • #1
abhineetK
18
0
A solid metallic body moves closer to a magnet. This causes increase in magnetic flux linked with the body. Eddy currents are generated in it.
Now, the problem is: will the body come back to its original position or will stay there?
I say that eddy currents will generate heat which will go waste. So, it must stop there/nearby after losing its energy completely.
But what would happen if energy is not lost as heat, will it come back to its original position so as to oppose the change in flux??So, will it try to make the flux linked with it equal to initial flux?
 
Physics news on Phys.org
  • #2
The eddy currents, following Lenz's law, will produce a magnetic force to oppose the motion. If there were 'no' resistance, the currents would be so high that the opposing force would equal the force pushing the object at the magnet. This happens in magnetic 'levitation' when a lead ball is suspended permanently, above a magnet when the temperature is low enough to make the lead a superconductor. You find that it bounces up and down. (There must be a Utube sequence, somewhere)
As energy is lost, the ball will fall, however; it can't stay where it started.
 
  • #3


I can provide an explanation for the phenomenon described in this scenario. Eddy currents are circular currents induced in a conductor when it is exposed to a changing magnetic field. In this case, the movement of the metallic body towards the magnet causes a change in the magnetic field, leading to the generation of eddy currents.

The generation of eddy currents results in the dissipation of energy in the form of heat. This heat energy is lost to the surroundings, and it is unlikely that the body will return to its original position. This is because the body has lost energy and momentum due to the generation of eddy currents, and it would require an external force to bring it back to its original position.

However, if the energy from the eddy currents is not lost as heat and is instead used to oppose the change in magnetic flux, then the body may have a tendency to return to its original position. This is because the eddy currents would create a magnetic field that opposes the change in flux, and this would result in a restoring force that could potentially bring the body back to its original position.

In summary, the behavior of the body in this scenario would depend on the amount of energy lost as heat due to the generation of eddy currents. If the energy is lost as heat, the body is unlikely to return to its original position. However, if the energy is used to oppose the change in flux, the body may have a tendency to return to its original position.
 

Related to Eddy currents and the motion of the body

1. What are eddy currents?

Eddy currents are circular electric currents that are induced in a conductive material when it is exposed to a changing magnetic field.

2. How do eddy currents affect the motion of a body?

Eddy currents can create a drag force on a moving body, slowing it down and causing it to lose kinetic energy. This can be seen in applications such as electromagnetic braking in trains and roller coasters.

3. How are eddy currents used in technology?

Eddy currents are used in a variety of technologies, including induction heating, metal detectors, and magnetic levitation trains. They can also be used to inspect conductive materials for defects or cracks.

4. Can eddy currents be controlled or minimized?

Yes, eddy currents can be controlled or minimized through the use of laminated or segmented materials, which reduce the flow of eddy currents by breaking up the conductive material into smaller pieces.

5. What are the potential dangers of eddy currents?

Eddy currents can cause heating in conductive materials, which can be a safety hazard in certain applications. Additionally, eddy currents can cause interference in electronic devices, leading to malfunctions or errors.

Similar threads

  • Electromagnetism
Replies
3
Views
1K
Replies
4
Views
521
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
2
Views
495
  • Electromagnetism
Replies
1
Views
641
Replies
20
Views
3K
Replies
11
Views
3K
Replies
5
Views
929
  • Electromagnetism
Replies
16
Views
2K
  • Electrical Engineering
Replies
6
Views
1K
Back
Top