Multiple choice general knowledge science & technology

The magnetic effect of electric current was first observed by

  1. Henry

  2. Oersted

  3. Faraday

  4. Volta
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hans Christian Oersted discovered in 1820 that an electric current flowing through a wire produces a magnetic field around it, causing a nearby compass needle to deflect. This was the first demonstration of the relationship between electricity and magnetism. Faraday later expanded on this with electromagnetic induction, while Volta worked on batteries and Henry on self-induction.

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