The School for Champions is an educational website that shows you how to achieve your dreams.
|
|
|
Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:Magnetic MaterialsThe following 36 comments and questions have been sent in. They are listed according to date. List of first 10 items
Buying magnetic substancesQuestionJuly 4, 2010 Dear Sir Shunmuganathan - India 20014 AnswerI am sorry, but we do not have that information. The best thing to do is to contact the company selling the product. Why does a spinning aluminum disk attract a magnet?QuestionJune 19, 2010 Spinning an aluminum disk strongly attracts a magnet. Moving a magnet rapidly on or near an aluminum strip(one example) strongly attracts the magnet to the strip. Can you explain why the magnetic properties increase when aluminum is set into motion in the vicinity of a magnet?? betel - USA 19934 AnswerI don't believe the spinning aluminum disk attracts a magnet. Magnet near an iron barQuestionJune 17, 2010 what should we do to neglect the effect of magnet on the iron bar place near the magnet? yugal - India 19925 AnswerIt depends on what you are trying to do. If you want to block out the magnetic field from the iron bar, you can place a sheet of iron between them. That will reduce the field for a short time. However, there really is no good way to block the magnetic field effectively. Diminishing the strength of magnetic flux lines?QuestionFebruary 22, 2010 Is there any substance or material that cancels or diminishes the strength of magnetic flux lines between magnets. For example, if I wanted to place a barrier of some sort between 2 magnets to reduce their attractive/repulsive forces, what other material could be used to cancel, reduce, or redirect the strength of the magnetic forces between two magnets? D - USA 19267 AnswerIf you put an iron sheet in between two magnets, the magnetic flux lines will be affected and reduce the attractive or repulsive forces. However, this will only occur until the iron itself is magnetized and becomes a magnet with a north and south poles on each side of the sheet. Convert a whiteboard to use magnetic pen?QuestionJanuary 27, 2010 Is it possible to make/convert a whiteboard using the concept of kid's magic board. A group of students is keen to explore this idea for their project module. Their idea is to stop using whiteboard markers and use a magnetic tip pen to do normal writing on the 'new' whiteboard. Thank you Chang - Singapore 19121 AnswerIt is an interesting concept. Note that there are LCD screens that allow you to write or draw with a plastic pen. There are also new screens that use e-ink that would respond to a magnetic pen. Can stainless steel be magnetized?QuestionJanuary 4, 2010 I found the below information on your site in search. I have a stainless steel product that contains magnets all along the back which adhere it to other metal surfaces but metal items do not adhere to front. If stainless steel cannot be magnetized, can it conduct magnetism? Justus - USA 18972 AnswerHigh-grade stainless steel is typically not magnetic. However, lower grade stainless steel may have some magnetic properties. Sometimes, the material is close to ordinary steel. Plotting a hysteresis curveQuestionNovember 25, 2009 can we plot hystersis curve of other than ferromagnetic materials? alka - Nepal 18738 AnswerMagnetic hysteresis is where the material has a slight memory of previously being magnetized. It is most often seen in ferromagnetic materials. However, you should be able to measure the curve in paramagnetic and diamagnetic materials too. The problem is that the strength of the magnetic is so low that there is difficulty in making measurements. What are semi-conductors?QuestionAugust 29, 2009 can you please tell me what are semi-conductors and can you explain electromagnetism asra - Pakistan 18223 AnswerMetals such as Copper are good conductors of electricity. A semi-conductor is a material like Silicon that is only a fair conductor of electricity, but it can have special properties, such as an external electrical field changes the semi-conductor's resistivity. Many devices such as transistor, solar cells, radios and telephones use semi-conductors. Can ferrous subtancess be attracted to a magnetic field ?QuestionAugust 5, 2009 can ferrous subtancess be attracted to a magnetic field if this material are fine grains i have seen a more than weird dust e die Gratten - USA 18114 AnswerOne demonstration of magnetic fields is using fine grains of either in or other ferrous substances to outline the magnetic field. But since he's fine grains also become miniature magnets, sometimes unusual effects can result from their interactions. Measuring temperature of mercury in a fieldQuestionJuly 27, 2009 i am doing one experiment, in this mercury is flowing through ss-316 which is having 150 degree centigrade temperature, in the presence of 2 Tesla magnetic field, i want to measure temperature in this environment, please give me idea for selection of prorer material (Type K --- Chromel ( Nickel-Chromium Alloy ) / Alumel ( Nickel-Aluminium Alloy))OR Type T --- Copper / Constantan, PLATINUM RTD. SRINIVAS - India 18066 AnswerAn infrared thermometer, which could take readings at a distance may work. But unfortunately, this subject is beyond the scope of our material. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
Top-rated books on Physical Science MiscellaneousWhat do you think?Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. We 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 can you go from here?
|
The School for Champions helps you become the type of person that can be can be called a Champion.
