alleryOersted's discovery (1820) was that:
AA magnet deflects light
BElectric charge attracts magnets
CMagnetism produces heat
DAn electric current creates a magnetic field
Answer & Solution
Correct answer: D. An electric current creates a magnetic field
1. Oersted observed a compass needle deflecting near a current-carrying wire.
2. This was the first evidence that ELECTRIC CURRENT and MAGNETISM are connected.
3. It set the stage for the unification of electricity and magnetism by Maxwell.
_Source: syllabus Science Ch 12 §12.1 Magnetic Effects of Current_
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