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Magnetic field outside a solenoid

  1. Jun 10, 2009 #1
    given a long solenoid, with a radius of R (R<<L), a current of I flows throught it. find the magnetic field at point A which is located at a distance of R from the solenoid on the solenoids line of symetry.

    HOW DO I DO THIS??

    the only thing i see that i think i need to do here is somehow use either biot savar or more likely ampere and solve it, but how?
    the only problems i have had with solenoid were to find the field inside of it in which case i took a closed loop integral and used amperes law to get B=μNI/L=μnI
     
  2. jcsd
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