Number of Turns Needed for a Good Solenoid

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SUMMARY

The optimal number of turns for a solenoid to achieve a homogeneous magnetic field (B field) inside while minimizing the field outside is not fixed, but generally, more turns (N) enhance the field's uniformity. A minimum of 50 turns is suggested for effective performance, though 1000 turns may be ideal for stronger fields. The solenoid's diameter significantly influences the B field strength; smaller diameters yield a stronger homogeneous B field. However, it is essential to note that magnetic flux will always loop around the outside of the solenoid.

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fisico30
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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?
Thanks
fisico30
 
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