Eddy current Losses due to different materials

[Physics lover]

Homework Statement

Which of the following material would have least Eddy Current losses-:
a)Air cored coil
b)Wooden cored coil
c)Laminated coil
d)Iron coil

Relevant Equations

None

I know only about Laminated,Iron and wooden coil.I don't know what is Air cored coil.
So according to me,it should be Wooden cored coil because less current will flow through wooden cored coil.Ans it will be maximum in Iron cored coil.
Please tell,am I correct or not?I don't know the answer.

 

[phinds]

Have you made any attempt to find out what an air cored coil IS?

 

[Physics lover]

Have you made any attempt to find out what an air cored coil IS?

Yes i searched it on google.But i was not able to understand it.So please help.

 

[phinds]

Air core just means non-conducting core. These would include air, plastic, wood, ceramic, etc.

 

[Physics lover]

Air core just means non-conducting core. These would include air, plastic, wood, ceramic, etc.

But wood is already there.But air is the poorest conductor so I think the answer should be air cored.Am I right?

 

[phinds]

But wood is already there.But air is the poorest conductor so I think the answer should be air cored.Am I right?

Perhaps I should have said non-ferrous. Do you understand how inductors work?

 

[Physics lover]

Perhaps I should have said non-ferrous. Do you understand how inductors work?

Yes an inductor is a device which opposes any current through it.We can also say that it opposes any change in flux passing through it.
If you are saying non ferrous,I will again change my answer to wood.

 

[phinds]

Yes an inductor is a device which opposes any current through it.We can also say that it opposes any change in flux passing through it.
If you are saying non ferrous,I will again change my answer to wood.

first, do you think air is ferrous?

Second, "opposes any change in flux passing through it" is correct but very incomplete and does not give me any confidence that you understand how inductors work. It sounds like you are just parroting something you read. I think you might be well served to study inductors a bit more.

 

[hutchphd]

Perhaps I should have said non-ferrous. Do you understand how inductors work?

You should have said non magnetic (ferro-,dia- or para-) and non conducting..

 

[Physics lover]

You should have said non magnetic (ferro-,dia- or para-) and non conducting..

yes I agree with you
Sorry phinds that was an incomplete definition but I understand it properly.
And I think you took me wrong.I agreed with the fact that an air cored conductor is made of non ferrous material.That's why I changed my answer to wooden core as non ferrous materials can also be slight condutors.

 

[phinds]

as non ferrous materials can also be slight condutors.

If non ferrous materials can be slight conductors (and I'm not arguing with that) then why would you think that wood is less conductive than air?

 

[Physics lover]

If non ferrous materials can be slight conductors (and I'm not arguing with that) then why would you think that wood is less conductive than air?

Ok so how will we decide between air cored and wood.Wood is a type of air cored.We cannot say anything,right?

 

[phinds]

Ok so how will we decide between air cored and wood.Wood is a type of air cored.We cannot say anything,right?

Again, I ask, do you think wood is less conductive than air? Look at it the other way 'round. Is air less conductive than wood?

 

[Physics lover]

Again, I ask, do you think wood is less conductive than air? Look at it the other way 'round. Is air less conductive than wood?

Absolutely not.

 

[Physics lover]

Absolutely not.

They both are insulators

 

[phinds]

Absolutely not.

Absolutely not WHICH? My point is, what causes the least eddy current, something with more conductance or something with less conductance?

 

[Physics lover]

Absolutely not WHICH? My point is, what causes the least eddy current, something with more conductance or something with less conductance?

Eddy current losses are due to more conductance.

 

[phinds]

They both are insulators

"insulators" are not non-conducting, they are just really bad conductors. Some insulators insulate better than others.

 

[phinds]

This is like pulling teeth. So, you think that exactly the same eddy currents will result whether you use wood or air?

 

[Physics lover]

Eddy current losses are due to more conductance.

I think that wood is a better conductor than air.

 

[Physics lover]

This is like pulling teeth. So, you think that exactly the same eddy currents will result whether you use wood or air?

I think you took me wrong.I am thinking that wood is a better conductor than air so more eddy currents will develop in it.

 

[phinds]

I think you took me wrong.I am thinking that wood is a better conductor than air so more eddy currents will develop in it.

So you are going to choose it as creating the least eddy currents, as per your posts #7 and #12.

 

[Physics lover]

So you are going to choose it as creating the least eddy currents, as per your posts #7 and #12.

Sorry for #12.I will chose #7 with an edit that I will change to air.As Air will have least eddy currents.
Am i right?

 

[phinds]

Sorry for #12.I will chose #7 with an edit that I will change to air.As Air will have least eddy currents.
Am i right?

Don't go back and change previous posts unless you indicate clearly in the post that it has been changed. Otherwise, people reading the thread can get confused.

 

[Physics lover]

Don't go back and change previous posts unless you indicate clearly in the post that it has been changed. Otherwise, people reading the thread can get confused.

I didn't edited my previous post.I am changing my opinion in my mind and not on the post.But now air is my final answer.