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Solenoid Field Strength - Missing Raduis?

  1. Apr 30, 2015 #1
    1. The problem statement, all variables and given/known data

    A long solenoid has 35 turns/cm. With a current of 4.0A, what is the field strength at the core?

    2. Relevant equations

    [tex] \beta = \frac{\mu N I}{2r} [/tex]

    3. The attempt at a solution

    I have no idea with the radius is; that's the entire problem statement above.
     
  2. jcsd
  3. Apr 30, 2015 #2

    TSny

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    The formula you gave is for a circular coil of short length. A different formula applies to the long solenoid. Check your notes or textbook.
     
  4. Apr 30, 2015 #3
    Using Ampere's law, we can derive the magnetic field inside a solenoid. It is B = u_o i n, where n is turns/length
     
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