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English
[en]
Foucault's pendulums that you see in science museums has have an electromagnet that gives the wire a kick each swing and keeps the pendulum swinging.
Korean
[ko]
과학 전시관에 있는 푸코 진자는 전자 자석이 달려 있어 멈추지 않고 계속 흔들립니다.
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