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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 DetectionThe following 7 comments and questions have been sent in. They are listed according to date. List of first 10 items
What is the strength of magnetic field of earth?QuestionOctober 22, 2009 what is the strength of magnetic field of earth. shivam - India 18554 AnswerIt varies between 30 microteslas or 0.3 gauss near the equator to over 60 microteslas or 0.6 gauss) around the magnetic poles. How can you tell the N side of a magnet?QuestionAugust 9, 2009 here i am confusing the magnet is have two particular as N and S can you show me what part is same as positive and what part is same as negative ? lobsang - UK 18133 AnswerThe best way to tell what part of a magnet is the N pole, use a compass. The N side of the compass will point to the N part of your magnet. The N side of the compass is called the North-seeking side. What exactly is a magnetic field?QuestionMarch 4, 2009 What exactly is a magnetic field? (Is it Ions?, electrons?) John - Sweden 17375 AnswerNo one really knows what it is. Years ago, it was thought that a magnetic and electrical fields were movement in a substance called aether. But that theory is no longer considered correct. Does computer monitor emit EMF?QuestionOctober 10, 2007 at the v. begining thanks 4 this site, really it's v. useful & helpful - Egypt 14508 AnswerAlthough some people have been concerned about electromagnetic frequency (EMF) radiation from the front of a computer monitor or television set, there is actually much more EMF coming out of the back of the monitor. It is uncertain whether that radiation is harmful to people. Pieces of cork jump away from charges rodQuestionMarch 22, 2006 1 A charged rod attracts bits of cork. But after touching the rod, the cork pieces jumped away from the rod. Explain? Rajat - INDIA 10551 AnswerThis is a static electricity problem. See those lessons. Site helped solve problem after lightning strikeQuestionOctober 8, 2005 After lightning recently struck a tree and an electrical line outside of our home, both our home and our neighbor's suddenly began experiencing strange power-related failures to certain appliances, switches, etc. Besides shorting out a wireless router, speakers and garage door openers, our TV (that sat on top of our refrigerator) started showing a purple "ghost" mark in the upper left corner. Stupidly, we went out and bought a new tv, thinking it had been ruined in the storm. Upon plugging in the new tv, we found the same problem. We moved and lifted the tv and realized something was wrong with the tv/fridge combo! We tried ceramic tiles underneath, a cutting board, plastic, but nothing helped. Then we Googled "refrigerator and tv magnetism" and your site popped up. We read your reader's problem, realized it was similar to ours, put a layer of foil on top of the fridge, and VIOLA! problem solved. Hooray for science! Thank you so much for your help. We are taking the new TV back and saving the 80$ to spend on foil. Jenny - USA 8460 AnswerThe surge of electrons and the related magnetic field can raise havoc with many electrical and electronic appliances. I'm happy to hear that you were able to get information from our site that helped you solve your problem. Refirgerator affecting TVQuestionApril 3, 2005 In the process of remodeling,we built in a refrigerator.Now on the other side of the wall, in the next room we have our television.We are getting strong color in the upper left hand corner of the TV.My son tells us this is the magnetic field from the refrigerator and will eventually leave this permanent mark on the TV.Is there anyway to block this or are we going to be forced to replace it with an LCD television? - USA 6524 AnswerIt could very well be the magnetic radiation coming from the back of the refrigerator, although I would be surprised it is that strong. 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?
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