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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:MagnetsThe following 70 comments and questions have been sent in. They are listed according to date. List of first 10 items
Is there enough information for my project?QuestionNovember 15, 2009 I AM ABOUT TO DO A PROJECT ON MAGNETS I HOPE THE INFORMATION FROM WEBSITE WILL BE ENOUGH INFO. THANKS FOR INFO. QUAN'TERRIO - USA 18669 AnswerDefine what you want to achieve in your project. Do you want to demonstrate the properties of magnets? Do you want to show how you can make iron or steel into a magnet? Do you want to show how to detect magnetism (like with a compass)? How long it takes magnets to lose their charge?QuestionOctober 23, 2009 i am designing something involving magnets. i need to know how long it takes magnets to lose their charge if they are made to repel each other frequently. i know the time will vary depending on the type of magnet. but i am curious to know how long it takes on average for a permanent magnet. thanks alot look forward to hearing from you. Jonathan - USA 18566 AnswerA permanent magnet will not lose its strength, no matter how much you use it. Heat and dropping the magnet can cause it to lose its strength. Artificial magnets gradually lose their strength a normal temperatures, due to the molecule movement. Electromagnets use soft iron and lose their strength as soon as the current is turned off. Why does the north pole of a magnet point to the North Pole?QuestionSeptember 27, 2009 When like poles repel, then why the north pole of a magnet point towards the north of the earth which has its own north pole? Mahesh - India 18392 AnswerThe N pole on a magnet is really called the north-seeking pole. Not calling it by its correct name causes much confusion. Does the size of a magnet affect its strength?QuestionSeptember 26, 2009 does the size of a magnet affect the strentgh of a magnet ? teaira - USA 18391 AnswerSome large magnets are very weak. The strongest are neodymium magnets, which are smaller than a penny in size. Where were magnets first found?QuestionAugust 23, 2009 (1) Electromagnets lose their magnetism if you put them in the refrigerator? - Singapore 18189 AnswerMagnets can lose their strength if heated. An electromagnet usually needs electricity to keep its strength, so it is possible that it would lose a little if cooled, but not much. How strong can a magnet get?QuestionApril 28, 2009 How strong can a magnet get when it comes to holding strength and how much pressure can a magnet make when pushing two magnets with the same poles together(ex.pushing a north pole against another north pole)? Garrett - USA 17671 AnswerSome Neodymium super-magnets can lift a piece of iron weighing over 1000 pounds. In general a Neodymium magnet can lift 500 times its own weight. Pushing two such magnets together N to N could require a force of 300-500 times their weight. Can a super magnet harm you?QuestionApril 19, 2009 Is having a piece of a super magnet in your pocket harmful for you? Also, I understand that in order to keep all the power of a magnet in one point is to cut the magnet in a close section. Thanks. AL - USA 17631 AnswerIt is know that magnets to have an effect of the body, but it is unlikely that having a super magnet in your pocket would be harmful to you. However, it could cause trouble if it was brought close to a credit card in your wallet or if you put a thumb drive in your pocket. Information could be erased from the magnet. What happens to the magnetic field if there is a notch?QuestionApril 6, 2009 What happens to the magnetic field of a bar magnet if it has a nitch cut out of it? Do you know of any sources covering this situation? Ken - USA 17565 AnswerThere would be a slight distortion of the field, but it would average out a short distance from the notch. Magnets are made in all sorts of shapes, so this would be just a minor variation. TV burned out during lightning stormQuestionOctober 19, 2008 One question: that surge protector you mentioned. do you know of any brands or name of devices? i have to find out what are they called in Danish, since my TV and computer monitor burned out during the storm i mentioned earlier. it will definitely be a great idea to have some sort of protection. i don´t believe my building has a lightning rod. Julian - Denmark 17461 AnswerMost stores that sell home computer equipment also sell electrical surge protector devices. That should also be true in Denmark. They have a circuit breaker that will trip from a high voltage surge, thus protecting your equipment. If lightning strikes somewhere nearby—even on a telephone line—they provide protection. But if it hits directly on your building, the power is sometimes too great for even the surge protector. In a severe storm, it is a good idea to unplug your equipment. Do magnets attract or repel in a vacuum?QuestionFebruary 6, 2009 Hi.I have this question: Dave - Australia 17218 AnswerMagnetic fields travel through vacuums and empty space. Scientists have sensitive instruments that can measure the magnetic field from the Moon and from the Sun. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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