Would any observer measure a non-zero magnetic field? if so, when would each observer first measure the field? explain your reasoning. 5. rank the initial magnitude of the magnetic field measured by each observer (i. e., the magnitude of the field that each observer first measures). explain your reasoning.

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.

thermal energy is the answer