List of Topics

SfC Home > Physics > Magnetism >

 

Feedback Comments on Magnetism

by Ron Kurtus

A total of 670 comments and questions have been sent in. They are listed according to date.

You can read them to further your understanding of the subject.



List of most recent 10 letters

Topic

Title

Country

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
 
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
 

Next 10

 





Questions on electromagetism

Topic: Basics of Magnetism

Question

February 17, 2017

DC Electromagnet.
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
ELECTRO-PERMENANT MAGNETS

tks. rgds, Vish

Viswanatan - India

27886

Answer

See our lessons on Electromagnetism. They should help answer some of your questions.

Back to top


How do electromagnets work in railway signals?

Topic: Electromagnetic Devices

Question

February 14, 2017

How electromagnet works in railway signals?

Harsh - India

27879

Answer

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.

Back to top


Placing electromagnet inside another electromagnet

Topic: Electromagnets

Question

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

27857

Answer

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.

Back to top


Srength of neodymium super magnets

Topic: Magnetic Materials

Question

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

26934

Answer

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.

Back to top


Why is copper used in a motor's stators?

Topic: Electromagnetism

Question

April 5, 2016

Hi Ron,

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

26903

Answer

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.

Back to top


Applying Lorentz force at the equator

Topic: Magnetism Lorentz

Question

March 2, 2016

is there is a possibility for applying the lorentz force in the earth magnetic field at the equator?

- India

26831

Answer

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.

Back to top


First grade science fair project

Topic: Magnetic Materials

Question

March 1, 2016

I work on magnetism for first grade science fair how to win?

faty - Senegal

26825

Answer

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.

Back to top


Used information for research

Topic: Electromagnetism

Question

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

26690

Answer

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.

Back to top


Ferromagnetism and solenoids

Topic: Solenoids

Question

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

26660

Answer

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.

Back to top


How does electric current create a magnetic field?

Topic: Moving Charges Create Magnetic Field

Question

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

26628

Answer

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.

Back to top

Next 10


Summary

Hopefully, this reader feedback has helped provide information about Magnetism issues.


Always do your best


Resources and references

Ron Kurtus' Credentials

Websites

Magnetism Resources

Books

Top-rated books on Magnetism


Questions and comments

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

Feel free to establish a link from your website to pages in this site.


Where are you now?

School for Champions

Magnetism topics

Feedback on Magnetism




Magnetism topics

Ferromagnetism

Electromagnetism

Also see



Let's make the world a better place

Be the best that you can be.

Use your knowledge and skills to help others succeed.

Don't be wasteful; protect our environment.

You CAN influence the world.





Live Your Life as a Champion:

Take care of your health

Seek knowledge and gain skills

Do excellent work

Be valuable to others

Have utmost character

Be a Champion!





The School for Champions helps you become the type of person who can be called a Champion.