Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field.
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Crookes radiometer
invented by Sir William Crookes
The Crookes radiometer (also known as a light mill) consists of an airtight…
Electric telegraph
invented by Francis Ronalds
An electrical telegraph was a point-to-point text messaging system, used from…
Metal detector
invented by Gustave Trouve
A metal detector is an instrument that detects the presence of metal nearby.…
Chlorofluorocarbons
invented by Frédéric Swarts
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or…
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