Oersted -Electromagnetic theory in 1820(July).
Ampere - Static needle -a component of galvanometer in 1820 (September).
Faraday - Electromagnetic induction in 1831.
Tesla - First Alternating current motor and transmission system in 1882.
The region of space where a charged object moves in the direction of magnetic force and induces current.
Thus, the scientist are arranged chronologically with their key inventions.
Learn more about magnetic field.
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