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Not just any material can be used to create an electromagnet. A ferromagnetic material, a material that is naturally magnetic, has to be used. Nickel, cobalt, and iron are ferromagnetic materials. Any of these three materials, or a mixture of one of these materials and another material, can be used with a solenoid and a battery to make an electromagnet. One difference between a magnet and an electromagnet is that when the electricity is turned off to an electromagnet, it no longer is magnetic.
Lighter colors reflect the light whereas the darker ones absorv it. If the sun "touches" our skin, we will get a sunburn, we can find lots of energy in the sun.
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