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3) yes compass is a magnet.
4) Electromagnet widely used as component of other electrical device such as Motors generator etc...
5) when an electric current flows through the coils the rod becomes magnetic and attractive pieces of iron attached to a clapper.the clapper hits the bell and makes it ring an electric bells Electromagnet is activated by an electric current passing through the coil of wire.
8) electromagnetism is a branch of Physics involving the study of electromagnetic force
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