In electromagnetism, permeability is the measure of the ability of a material to support the formation of a magnetic field within itself.
Sewing machine bobbin is used to create electromagnet. When there is no material present inside the bobbin, strength of an electromagnet
is very low. Inserting an iron material significanly increases strength of the magnetic field. This can be seen by the amount of iron
filinigs lifted by an electromagnet.

Try different materials instead of iron and do let me know your findings.

Music:

Life of Riley
Kevin MacLeod
is licensed under a Creative Commons Attribution licence

#231_EM_MagneticPermeability

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