by Ron Kurtus
You can read them to further your understanding of the subject.
|Magnetic Materials||Wands free books on EMF||Ethiopia|
|Moving Charges Create Magnetic Field||How is magnetic field created?||India|
|General||Device using small disc magnet||Canada|
|Solenoids||Solenoid and electromagnet||India|
|Basics of Magnetism||Questions on electromagetism||India|
|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|
Wands free books on EMF
Topic: Magnetic Materials
May 30, 2018
Hello I am bereket, age 20 and I'm from Ethiopia. I want to ask you how I can get free online books on EMF.
Bereket - Ethiopia
There are some free downloads on EMF from Free Books - EMF.
I'm not sure how extensive they are, but they might give you what you want.
Best wishes for success in your studies.
How is magnetic field created?
Topic: Moving Charges Create Magnetic Field
November 7, 2017
how megnetic field created around electric current
ravi - India
Electrical charges have an electric field around them. When the charges move a magnetic field is created perpendicular to that movement. An electric current consists of moving electrical charges.
Device using small disc magnet
September 6, 2017
Good morning Ron. My son and I are developing a low tech medical device that relies on the attraction between a small disc magnet 20 mm x 2 mm and a similarly sized flat washer. We're having a problem with the amount of attraction between the two and need to increase it and are thinking about increasing the size of the magnet or the washer but are constrained in doing this due to physical dimensions. Is there anything readily available such as a flat washer or disc with a higher than normal iron content that would cause the magnet to be more strongly attracted to it? Many thanks!
Niall - Canada
You might try a Neodymium disc magnet. They are small, strong and inexpensive and can be bouht through Amazon.com or other outlets.
I hope that helps. Best wishes for success with your device.
Solenoid and electromagnet
June 13, 2017
Why solenoid is used for making electromagnet
Nishant - India
A solenoid is an electromagnet without the iron core in it. The solenoid can be used to pull a core inside it.
Questions on electromagetism
Topic: Basics of Magnetism
February 17, 2017
1. Ratio of Core area & Poles face area.
2. What is ATTRACTION POWER?
3. If three sides of magnet is covered with non magnetic material will there be more force on pole faces.
4. Construction & operation details of
tks. rgds, Vish
Viswanatan - India
See our lessons on Electromagnetism. They should help answer some of your questions.
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.
Hopefully, this reader feedback has helped provide information about Magnetism issues.
Always do your best
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