What is the difference between a permanent magnet and an electromagnet

As the name says it, electromagnet are temporary and only lasts for a short period of time, while a permanent magnet is meant to last long.

Electromagnet are also created only when an electric current passes through a coil of wire surrounding the electromagnet, while a permanent magnet creates its own persistent magnetic field.

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  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is