05-전자기력의 과학
17/10/18 11:09
5. 전자기력의 과학
What is the electromagnetic force?
“On the face of it both electricity and magnetism are remarkably similar to gravity. Just as two masses are attracted to each other by an inverse square force, the force between two charged objects, or two poles of a magnet are also inverse square. The difference is that gravity is always attractive, whereas electricity and magnetism can be either attractive or repulsive. For example, two positive charges will push away from each other, while a positive and negative charge will pull toward each other. As with gravity, electricity and magnetism raised the question of action-at-a-distance. How does one charge “know” to be pushed or pulled by the other charge? How do they interact across the empty space between them? The answer to that question came from James Clerk Maxwell.”
-- by Brian Koberlein, https://briankoberlein.com/2015/02/27/dance-of-the-hag/
Homework Assignment : 5. 전자기력의 과학 - 미리 공부하기 (제출기한: 10월21일(일))
- 교재 ‘호기심의 과학’: 전자기력의 과학, pp 141-172("스마트폰 배터리 한 개로 들어올릴 수 있는 사람 수는?", "자석은 왜 철을 끌어당길까?")과 관련 자료를 찾아서 공부하고, 아래 "Suggested Questions"를 참고하여 자기만의 질문을 만들어 "Comments (댓글)" 링크에 올려주기 바랍니다.
Useful Links and Further Reading:
- Boaz Almog: The levitating superconductor, [TED] https://www.ted.com/talks/boaz_almog_levitates_a_superconductor
- 10 Ways to SEE the ELECTRIC FIELD - Part 1 - [youtube] https://www.youtube.com/watch?v=Y6YdC2UoDYY
- 10 Ways to SEE the ELECTRIC FIELD - Part 2 - [youtube] https://www.youtube.com/watch?v=bOLd2KVK-Mo
- The Story of Electricity Full Episode, [youtube] https://www.youtube.com/watch?v=hVu844ZcCdU
- What Really is Magnetism? : Documentary on the Science of Magnetism, [youtube] https://www.youtube.com/watch?v=Ht5iQyqoors
- ELECTROMAGNETISM, [youtube] https://www.youtube.com/watch?v=bht9AJ1eNYc
- Electromagnetism - Maxwell's Laws, [youtube] https://www.youtube.com/watch?v=9Tm2c6NJH4Y
- How Special Relativity Makes Magnets Work, [youtube] https://www.youtube.com/watch?v=1TKSfAkWWN0
Suggested Questions
- '전기'의 존재를 어떻게 알 수 있을까?
- 전기에너지 자체를 저장하는 것은 쉬운 일이 아니다. (왜 그럴까?) 그렇다면, 배터리에는 어떤 형태의 에너지가 저장되어 전기 에너지를 만들어 낼 수 있을까?
- 자석의 힘은 오랜동안 미스터리로 남아 있었다. 자석의 힘과 전기력의 연결고리는 어디에서 찾은 것일까?
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