Which Danish physicist discovered in 1820 that an electric current creates a magnetic field?
Answer and explanation
Correct answer: D. Hans Christian Ørsted
- Step 1: Ørsted noticed that a compass needle moved near a wire carrying current. Step 2. This discovery of electromagnetism changed physics. Answer: Hans Christian Ørsted. Why not the others: Bohr worked on atoms in the twentieth century, Rømer on the speed of light, and Brahe on astronomy.
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