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Homework Help: Questions on Magnetic Induction

  1. Feb 26, 2005 #1
    1.Why must you use insulated copper wire for the coils of an electromagnet?
    2. How does the strength of a wooden core electromagnet compare with that of the iron electromagnet?
    3. How does the magnitude of the current affect the strength of the electromagnet?
    4. How does the number of turns affect the strength?
    5. How was this equation derive?
    B= UoNI /2a

    Thanks in advance. :confused: :smile:
  2. jcsd
  3. Feb 26, 2005 #2
    did you try to answer it? what is your answer?
  4. Feb 26, 2005 #3
    Yes, i tried to answer question 5..but got it wrong..i keep solving it but still i didn't get it right.
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