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Field on Axis of a Ring Magnet



Calculates the field strength on the axis of an axially magnetized ring magnet.

Fill in all of the black-outlined boxes, and the results will appear in the light-gray boxes. Units may be selected as either CGS (Gauss, in.) or SI (mTesla, mm). The required geometrical inputs are defined in the diagram. Negative values of "d" calculate the axial field strength below the top surface of the ring magnet.

This calculation works best with magnetic materials displaying "straight line" demagnetization curves.
Unit System
Outside radius [inches]
Inside radius [inches]
Length [inches]
Distance from magnet (d) [inches]
Residual induction (Br) [G]
Material type
Results
Field at point d [G]
Field at center of ring [G]
Optimum Length [inches]

The above calculation is for reference only and Dexter Magnetic Technologies Inc. will not be held liable for its use. Please contact us for specific assistance should you require it.