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sgstudent
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What happens? I think nothing should happen since the rods will not get magnetised at all due to the ac current..
Thanks for the help!
Thanks for the help!
technician said:If you have low frequency AC then the bars will become magnetised with changing magnetic polarity. The bars could repel each other although the fact that one bar is steel and the other is iron will produce different strengths so ...? Not sure !
At higher ( mains) frequencies I think you are maybe correct!...I know that mains AC solenoids can be used to demagnetize steel bars by withdrawing them slowly.
I imagine there is not one simple answer.
what happens? I think nothing...
gsal said:That's probably not true, right? I mean nothing does not happen...I am sure something happens, it is a matter of whether what happens is of interest to you or not or whether it affects you or not...so, maybe some context would have been nice.
Maybe the rods do not get magnetized because of the changing magnetic field, but something happens...because the relative motion between the magnetic field and the rods, eddy currents will be induced into the rods and they will heat up due to their internal resistance...certainly the iron rod, I don't know about the steel one, if by making it out of steel, they meant non-magnetic steel?
The question just said, if the dc current was changed to a low frequency ac current, describe what will happen to the rods and explain why
gsal said:Nope, the original posting said absolutely nothing about dc.[/Q
It was a three part question (a) when a steel and iron rod is placed inside a solenoid with a dc current explain what happens (b) what if its iron and copper rod (c) what happens if the experiment was repeated in (a) but a low frequency ac current was used instead of dc.
Steel won't be magnetised easily right? But the magnetic field will still pass through it and change direction. So since its the magnetic field that causes the attraction/repulsion so both the iron and steel will still repel each other?
Besides this, I'm not sure why when I draw magnetic field lines of a magnetic shielding object eg iron, the iron won't get magnetised as well. Because I only draw the lines of the magnet passing through the iron so I'm unsure about this too.
technician said:If you have low frequency AC then the bars will become magnetised with changing magnetic polarity. The bars could repel each other although the fact that one bar is steel and the other is iron will produce different strengths so ...? Not sure !
At higher ( mains) frequencies I think you are maybe correct!...I know that mains AC solenoids can be used to demagnetize steel bars by withdrawing them slowly.
I imagine there is not one simple answer.
I don't quite get it, slowly is meant to demagnetise it, but I'm still unsure about what if the observations in this case.NascentOxygen said:To demagnetise a steel object you slowly withdraw it from within a strong AC field. Emphasis on the "slowly".
The purpose of placing a steel rod and an iron rod inside an AC current solenoid is to create a strong magnetic field. The steel and iron materials are ferromagnetic, meaning they can be easily magnetized by an external magnetic field. When an AC current flows through the solenoid, it creates a constantly changing magnetic field, which in turn magnetizes the steel and iron rods, resulting in a stronger overall magnetic field.
The presence of the steel and iron rods inside the AC current solenoid significantly increases the strength of the magnetic field. This is because the ferromagnetic materials are easily magnetized and can retain their magnetization even after the current is turned off. Additionally, the steel and iron rods are able to concentrate the magnetic field lines, making the overall field stronger.
Yes, there is a difference between using a steel rod and an iron rod inside an AC current solenoid. Steel is a stronger ferromagnetic material compared to iron, meaning it can be magnetized to a greater extent. This results in a stronger magnetic field when using a steel rod. However, iron is cheaper and more readily available, so it may be a more practical option for some applications.
Yes, the direction of the magnetic field can be changed by using a steel rod and an iron rod inside an AC current solenoid. This is because the steel and iron rods can be magnetized in different directions depending on the direction of the current flowing through the solenoid. By changing the direction of the current, the direction of the magnetic field can also be changed.
Yes, there are other materials that can be used instead of steel and iron rods inside an AC current solenoid. Some examples include nickel, cobalt, and certain alloys that exhibit ferromagnetic properties. However, steel and iron are the most commonly used materials due to their availability and cost-effectiveness.