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Magnetic Field of A Solenoid.

  1. May 5, 2017 #1
    1. The problem statement, all variables and given/known data
    A 470-turn solenoid having a length of 25cm and a diameter of 10cm carries current of 0.29A. Calculate the magnitude of the magnetic field inside the solenoid.

    2. Relevant equations
    ##B=μ_0nI##
    where ##n=\frac N L##
    ##μ_0=4π.10^{-7}\frac {Tm} {A} ##
    ##n=\frac {470} {0.25m}=1880\frac 1 m##


    3. The attempt at a solution
    ##B=μ_0nI##
    ##B=4π.10^{-7}\frac {Tm} {A} 1880\frac 1 m 0.29A##
    It gives me ##0.68mT## but answer says its ##0.71mT##

    I didnt understand where I am doing wrong.Question also gives us the diameter but I dont know where to use it.
     
  2. jcsd
  3. May 5, 2017 #2

    gneill

    User Avatar

    Staff: Mentor

    Your calculations look okay to me.

    Someone may have changed the problem a bit (to make it a "new" problem) but forgot to update the answer key. I note that had the current been 0.30 A rather than 0.29 A that their answer would be correct.
     
  4. May 5, 2017 #3
    Probably yeah thanks
     
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