Eddy Current Questions | Refresh Understanding

In summary, eddy currents are circular electric currents induced in a conductive material by a changing magnetic field. They are created when a conductive material is exposed to a changing magnetic field and have various applications in industries such as non-destructive testing and metal sorting. Eddy currents can be detected using methods such as measuring changes in the magnetic field or electrical resistance. The strength of eddy currents is affected by factors such as the strength and frequency of the magnetic field, material properties, and nearby materials.
  • #1
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Need to refresh my understanding on eddy current.
Does every metal exhibit eddy current when it comes across a Mag field?
If this is the case, then why do induction cook tops required ferrous utensils.
A Metal detector also works on the principle of eddy current. correct?
 
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  • #2
There is quite a lot online about eddy currents, have you tried looking it up?
1. yes - provided the B-field changes
2. the heat depends on resistivity as well as current
3. yes - amongst others
 

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 work?

Eddy currents are created when a conductive material, such as metal, is exposed to a changing magnetic field. This changing magnetic field induces a flow of electrons, causing circular currents to form within the material. The strength and direction of the eddy currents depends on the strength and direction of the changing magnetic field.

3. What are the applications of eddy currents?

Eddy currents have various applications in different industries, such as non-destructive testing, metal sorting, and induction heating. They are also used in devices like metal detectors and speed sensors.

4. How are eddy currents detected?

Eddy currents can be detected using different methods, such as using a coil or sensor to measure changes in the magnetic field induced by the eddy currents. Other methods include measuring changes in electrical resistance or using visual techniques with magnetic particles.

5. What factors affect the strength of eddy currents?

The strength of eddy currents is affected by several factors, including the strength and frequency of the changing magnetic field, the electrical conductivity and permeability of the material, and the size and shape of the material. Additionally, the presence of nearby materials can also impact the strength of eddy currents.

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