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Physics Review Question Unit: Year: 1994 Question#: 34 Question: An electromagnet would have the greatest strength if its wire were wrapped around a core made of (1 ) wood (2 ) iron (3 ) aluminum (4 ) copper What's the question really asking? Explanation by: Danielle [ Return to question menu ] Answer 1 wood INCORRECT Wood is not very permeable to a magnetic field. It has no way to help continue the field. return to top Answer 2 iron CORRECT Iron, cobalt and nickle are all quite permeable to magnetic fields because they have the ability to become magnets themselves. (it has to do with un-paired electron spins) return to top Answer 3 aluminum INCORRECT Aluminum is a good electrical conductor but it has little permeability to a magnetic field. It has no way of becoming a magnet itself. return to top Answer 4 copper INCORRECT Copper is a good electrical conductor but it has little permeability to a magnetic field. It has no way of becoming a magnet itself. return to top What's this question really asking? What has the most magnetic permeability? return to top |
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