In which year did Hans Christian Oersted discover that a compass needle gets deflected when an electric current passes through a metallic wire placed nearby?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 1820.
Hans Christian Oersted discovered in 1820 that a compass needle deflects when an electric current passes through a nearby metallic wire. This groundbreaking finding established the fundamental relationship between electricity and magnetism, laying the groundwork for the field of electromagnetism.