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Solenoid question

  1. Nov 8, 2011 #1
    Hello Forum,

    How many turns do we need to make a good solenoid? 50, 40 ,1000?

    I know the more turns, the larger N, the better. But what is the minimum number of turns to create a homogeneous B field inside the coil and an almost zero B field outside?

    Does the cross-sectional area of the solenoid matter, i.e. the diameter of the turns?

    I guess the solenoid diameter will determine the strength of the B field inside the solenoid: the smaller the radius of the turns the stronger will be the homogeneous B field?
  2. jcsd
  3. Nov 8, 2011 #2

    Simon Bridge

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