by Ron Kurtus
You can read them to further your understanding of the subject.
|Electromagnetic Devices||How do electromagnets work in railway signals?||India|
|Electromagnets||Placing electromagnet inside another electromagnet||USA|
|Magnetic Materials||Srength of neodymium super magnets||Philippines|
|Electromagnetism||Why is copper used in a motor's stators?||USA|
|Magnetism Lorentz||Applying Lorentz force at the equator||India|
|Magnetic Materials||First grade science fair project||Senegal|
|Electromagnetism||Used information for research||USA|
|Solenoids||Ferromagnetism and solenoids||Nigeria|
|Moving Charges Create Magnetic Field||How does electric current create a magnetic field?||Nigeria|
|Basics of Magnetism||Why do opposite poles of a magnet attract?||Ethiopia|
How do electromagnets work in railway signals?
Topic: Electromagnetic Devices
February 14, 2017
How electromagnet works in railway signals?
Harsh - India
Railway signals can be flashing lights or a moving barrier.
An electromagnet could be used as a solenoid to turn on or turn off the railway signals.
The barrier is usually moved by an electric motor.
Placing electromagnet inside another electromagnet
February 5, 2017
I have a new found curiosity for electromagnets. I'm not a scientist or even a student... just curious. What would happen if your electromagnet core contained another electromagnet?
Ron - USA
If the core is movable, you would have a solenoid of sorts. (See Solenoids are Electromagnetic Devices).
Instead of having a movable iron core or magnet core, you would place an electromagnet there. This would allow movement of the core to be finely tuned. However, I don't think I've even seen such a configuration.
Srength of neodymium super magnets
Topic: Magnetic Materials
April 15, 2016
I have 3 pcs N52 neodymium super magnets. How do I know the strength of attraction between the two of them in contact with each other without anything in between, or conversely how strong they will push each other apart it they measure 10 mm x 5 mm x 2 mm, with the poles on the larger faces (5 x 10) and, if the poles are on the smaller faces (5 x 2)?
Junnel - Philippines
Since there is a wide variation on the strength of neodymium super magnets, the best way to find the strength of attraction and repulsion would be to experimentally measure it. For example, you could use a spring scale to measure the force required to pull the two magnets apart.
Other than that, I don't readily know of equations to allow you to predict the forces.
Why is copper used in a motor's stators?
April 5, 2016
My question, if you don't mind, is why do I see copper used if iron in the below stator if they are weak magnets? Cost?
Thanks for the information on your site and for replying to me email if you have the time.
Richard - USA
The stator in an electric motor is the stationary part of the motor’s electromagnetic circuit. It usually consists of copper windings to create the magnetic field.
The copper is much more efficient than using iron wire.
Applying Lorentz force at the equator
Topic: Magnetism Lorentz
March 2, 2016
is there is a possibility for applying the lorentz force in the earth magnetic field at the equator?
The Lorentz force has been use with wires having from a space vehicle in order to create a current from the Earth's magnetic field.
However, the movement of a wire at the equator would not be enough to create a current.
First grade science fair project
Topic: Magnetic Materials
March 1, 2016
I work on magnetism for first grade science fair how to win?
faty - Senegal
Your goal in the science fair should be to do your best to show others about magnetism as well as to do an excellent job.
You can demonstrated or show some effects of magnetism. See Magnetism Project: Make an Electromagnet for an example.
Note that it is important to have a display or some sort that others can see.
Best wishes on doing a great job in your project. I am sure you will.
Used information for research
January 13, 2016
I used this page for research for my science fair project. Don't worry, I did not copy, but I do appreciate this page on electromagnetism.
Kelsey - USA
I'm glad the material was useful to you and your science fair project. It would be good to cite this website, as well as others where you got information in your report. That improves the validity of your experiment.
Best wishes for success in your project.
Ferromagnetism and solenoids
January 4, 2016
does ferromagnetism involves a metal core wrapped round with an coil of wire wrapped round it and connected to an electric current if yes isn't this same as a solenoid?
kevwe - Nigeria
A solenoid is simply a coil of wire with no iron core. Current through the wire creates an electromagnetic field. If an iron rod is placed inside the coils, it will be drawn in. That is the concepts of a solenoid switch.
Ferromagnetism concerns forming magnets in iron objects. (Ferro = iron). A solenoid can cause an iron core to become magnetized.
How does electric current create a magnetic field?
Topic: Moving Charges Create Magnetic Field
December 15, 2015
how does an electric current creates a magnetic field when a current is passed through a wire. what is the process that goes on which causes the magnetic field to be formed by a current.
kevwe - Nigeria
Electric and magnetic fields are tied together, such that when one changes, it causes the other to change. It is a property of matter.
An electron has an electric field, but there is no noticeable magnetic field until the electron starts to move. When the electron moves, it creates a magnetic field, which moves along with it. Thus, a current in a wire is surrounded by a magnetic field.
Why do opposite poles of a magnet attract?
Topic: Basics of Magnetism
October 29, 2015
why opposite poles of a magnet attract and identical poles repel each other?
moges - Ethiopia
It is a property of magnetic fields and it similar to static electricity where opposite charges attract and like charges repel.
Hopefully, this reader feedback has helped provide information about Magnetism issues.
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