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- need a simple mathematical formula to calculate the pull strength of a neodymium magnet

i have a neobydium magnet of grade n40 , the diameter of magnet is 15mm and thickness is 10 mm ,

now i want to calculate the pull force between this magnet and a steel plate when there is no gap between them ;

& in second case i want to calculate the pull force when i put a 0.15mm copper plate between magnet and steel plate ,

does introducing copper plate reduce the pull strength , and if yes how ?

can you get me a formula by which i can calculate the pull strenth of magnet in the above mentioned conditions

i need a simple mathematical formula

now i want to calculate the pull force between this magnet and a steel plate when there is no gap between them ;

& in second case i want to calculate the pull force when i put a 0.15mm copper plate between magnet and steel plate ,

does introducing copper plate reduce the pull strength , and if yes how ?

can you get me a formula by which i can calculate the pull strenth of magnet in the above mentioned conditions

i need a simple mathematical formula