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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

Geometry:

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.

Task:

Calculate the pulling force between two magnets.

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

Result:

Pull force

QuickField

3.51 N

Reference*

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

* Reference: www.kjmagnetics.com.

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There are no restrictions applied to the QuickField Student Edition postprocessors.
You can view field maps, make plots, calculate integrals and print pictures in the same way that the Professional Edition users do.