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Homework Help: Solenoid Magnetic Field wire spacing Help

  1. Aug 6, 2010 #1
    1. The problem statement, all variables and given/known data
    You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire.
    What magnetic field strength would you obtain inside a 2.0cm diameter solenoid with the wire spaced as closely as possible?

    2. Relevant equations

    3. The attempt at a solution
    I found the number of loops by
    D=.002+2*1*10-3m (diametre plus 2 radi of wire)???
    then n=12/circumfrence =173.6turns (C=pi*D
    then I subbed all the values and got 0.0037T which is wrong
    all help appreciated - I think my problem is in calculating the number of turns??
  2. jcsd
  3. Aug 6, 2010 #2
    The diameter of the wire will effect the pitch (loop density) of the coil, but not the total number of loops. I take it you have the answer to the problem?
    Last edited: Aug 6, 2010
  4. Aug 6, 2010 #3
    Hey, its for an online mastering physics test - - - - using D as .02m I get .00408T but I didnt use the radius at all so I think it may be wrong???
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