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Surface field vs pull force(attraction force) of multiple magnets?

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In the following "semi" table, is a group of magnets,
all seem to have the same Surface field but all different pull force(attraction/repulsive force at maximum with gap = 0).
How is it possibile to have the same S.field rate but different forces? Is it due to the size of each magnet?


Magnets Length Width Thickness Surface Field Pull Force
(Gauss) (lb)

B444 1/4 " 1/4 " 1/4 " 5754 4.25
B666 3/8 " 3/8 " 3/8 " 5754 10.07
B888 1/2 " 1/2 " 1/2 " 5754 18.71
BCCC 3/4 " 3/4 " 3/4 " 5754 40.59
BX0X0X0 1 " 1 " 1 " 5754 76.41

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