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Attraction of the block magnets

Two rectangular prism shaped permanent magnets are pulled to each other.

Problem type:
Plane-parallel problem of magnetostatics


w=1.5" (38.1 mm) - magnet width;
t=0.25" (6.35 mm) - magnet thickness;
l=0.25" (6.35 mm) - magnet length;
δ=0.5" (12.7 mm) - gap between the magnets.


Calculate the pulling force between two magnets.

To calculate the correct result an integration contour is drawn in the air around one of the magnets.


Pull force


3.51 N


3.50 N (0.77 lb, 1 lb = 4.54 N)

* Reference: www.kjmagnetics.com.

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