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Physics
Classical Physics
Electromagnetism
Magnetic field outside a solenoid
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[QUOTE="Charles Link, post: 6266667, member: 583509"] I could be wrong, but isn't the current in the ##z ## direction from the solenoid simply equal to ## I ##? For a finite length ## L ##, a Biot-Savart calculation will provide an answer, but it really unnecessarily complicates the concepts at hand, unless you really need to get an answer for what its value is. ## \\ ## For a long solenoid, ampere's law can be used to compute the ## \phi ## component of ## B ## outside the solenoid. There is sufficient symmetry that ampere's law is applicable for a long solenoid, and the current crossing the plane inside a circle of radius ## r ##, ( ## r > a ##), that is parallel to the x-y plane is simply ## I ##. Thereby you can compute ## B_{\phi} =\frac{\mu_o I}{2 \pi r} ## for ## r>a ##, independent of ## z ##. [/QUOTE]
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Magnetic field outside a solenoid
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