Oerstedt discovers electromagnetism
- 1. In the early 19th century, Hans Christian Oersted, a Danish physicist, made a groundbreaking discovery that would lay the foundation for the field of electromagnetism. On April 21, 1820, during a lecture demonstrating the effects of electric currents, Oersted noticed that a compass needle deflected from magnetic north when an electric current passed through a nearby wire. This observation was revolutionary; it illustrated the intimate relationship between electricity and magnetism, previously thought to be unrelated phenomena. Oersted's experiment showed that an electric current can produce a magnetic field, effectively linking the two forces in a unified theory. This pivotal moment not only marked the discovery of electromagnetism but also inspired future scientists, such as André-Marie Ampère and Michael Faraday, to further explore and expand upon this new understanding of physics. Oersted's work sparked a wave of research in the newly emerging field and ultimately led to the development of numerous technologies that harness the principles of electromagnetism, including electric motors, generators, and telecommunication systems, forever altering the landscape of science and engineering.
What year did Hans Christian Oersted discover electromagnetism?
A) 1901
B) 1945
C) 1820
D) 1752
- 2. What type of field was Oersted studying when he discovered electromagnetism?
A) Magnetic field
B) Gravitational field
C) Electric field
D) Heat field
- 3. In Oersted's experiment, what did he observe when he passed an electric current through a wire near a compass needle?
A) The needle heated up
B) The needle spun around
C) The needle deflected
D) The needle did nothing
- 4. What does the discovery of electromagnetism describe?
A) The discovery of radio waves
B) The discovery of the electric charge
C) The relationship between electricity and magnetism
D) The invention of the light bulb
- 5. Which scientist developed the first electromagnet following Oersted's discovery?
A) William Sturgeon
B) Albert Einstein
C) Isaac Newton
D) Marie Curie
- 6. Oersted's discovery laid the foundation for the development of which technology?
A) Automobiles
B) Telegraph machines
C) Steam engines
D) Electric motors
- 7. What scientific principle underlies the operation of electric generators?
A) Quantum mechanics
B) Special relativity
C) Nuclear fission
D) Electromagnetic induction
- 8. What university did Oersted teach at when he made his electromagnetism discovery?
A) University of Paris
B) Oxford University
C) Harvard University
D) University of Copenhagen
- 9. What material did Oersted pass an electric current through in his experiment with the compass needle?
A) Wood
B) Wire
C) Rubber
D) Glass
- 10. Oersted's discovery united which two fields of study?
A) Chemistry and biology
B) Psychology and sociology
C) Astrophysics and geology
D) Electricity and magnetism
- 11. Who later developed the mathematical formulation for electromagnetism?
A) James Clerk Maxwell
B) Erwin Schrödinger
C) Albert Michelson
D) Max Planck
- 12. Oersted's discovery led to the concept of a magnetic field being produced by what?
A) Static charge
B) Radio waves
C) Electric current
D) Gravity
- 13. What was Hans Christian Oersted's nationality?
A) Danish
B) Swedish
C) German
D) French
- 14. Which of the following materials can be easily magnetized?
A) Plastic
B) Rubber
C) Iron
D) Paper
- 15. What property of a material determines how easily it can be magnetized?
A) Permeability
B) Density
C) Color
D) Hardness
- 16. What electromechanical device is used to transmit electrical energy between two or more circuits through electromagnetic induction?
A) Diode
B) Capacitor
C) Resistor
D) Transformer
- 17. What is the process called when an electric current flows through a conductor in the presence of a magnetic field resulting in a force on the conductor?
A) Bernoulli's principle
B) Lorentz force
C) Hooke's law
D) Bohr effect
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