by Ron Kurtus
You can read them to further your understanding of the subject.
|Electromagnetism||Relationship between magnetic force and electricity||Nigeria|
|Basics of Magnetism||Reducing permanent magnetism||New Zealand|
|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|
Relationship between magnetic force and electricity
October 23, 2018
my question is, what is the relationship between magnetic force and electricity?
Abdulrahman - Nigeria
See Moving Electrical Charges Create Magnetic Field. It shows that when electrical charges move, they create a magnetic force field. Likewise, a magnetic force can create electricity. See Basics of Electromagnetism.
October 8, 2018
what is in the iron that makes magnetic substance attracted by it
obed - Ghana
It is the alignment of the electrons. See: Factors Determining Magnetic Properties.
Reducing permanent magnetism
Topic: Basics of Magnetism
October 6, 2018
If you have a weak permanent magnet and wind a multi turn coil around it and then pass an electrical current through the coil, can you negate the magnet strength of the magnet?
Will a specific current be required to reduce the magnet strength to exactly zero?
Charlie - New Zealand
You can demagnetize a permanent magnet by hitting it with a hammer or heating it to a sufficient temperature. Both cases disrupt the alignment of the atoms.
The problem with using a coil is that the atoms can be realigned into a different direction, thus still maintaining the magnetism. The only way to reduce the strength of the magnet is to get some or all of the atoms in random orientation.
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.
Hopefully, this reader feedback has helped provide information about Magnetism issues.
Always do your best
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