If we need 1T at 250um, we would need 100A. 20um away, at x250um, the field strength is 0.0165T. In this example the last coil resides at x230um (0.81 T). You wanted to know the field strength adjacent to the coil. See Magnetic Forces and Fields for a discussion on this. The second plot is the field strength at Z0 along the x-axis. A similar application of the magnetic field distribution created by Helmholtz coils is found in a magnetic bottle that can temporarily trap charged particles. Solenoid Magnetic Field Calculator: Calculating the magnetic field inside a solenoid coil is not easy. Helmholtz coils typically have loops with equal radii with current flowing in the same direction to have a strong uniform field at the midpoint between the loops.
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