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is the production of a magnetic field by a current in a conductor

Many types of useful devices that uses electromagnetism

in 1263, he mapped the magnetic field of a lodestone with a compass

In 1600, he concluded that earth itself is a giant magnet

1820, he stated that magnetism and electricity were related

They independetly discovered that a changing magnetic field produced a current in a coil of wire

Dynamo is also called as

In the late 19th century, he discovered that magnet loose their magnetism above a certain temperature.

it is called _ when magnets reach above a certain temperature where they loose their magnetism

in the 1900's scientist discovers