The work done by a spring depends on . a.) the initial and final displacements of the spring
b.) the difference between the spring's initial and final displacements
c.) the average displacement of the spring
d.) the squares of the spring's initial and final displacements
e.) the inverses of the spring's initial and final displacements

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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