Alength of copper wire carries a current of 15 a, uniformly distributed through its cross section. calculate the energy density of (a) the magnetic field and (b) the electric field at the surface of the wire. the wire diameter is 2.6 mm, and its resistance per unit length is 4.5 ω/km.

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.

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat