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電磁小火車
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吳瑞聰
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Jan 8, 2015, 12:56:45 AM
1/8/15
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一個銅線圈、一個鹼性電池、四個強力磁鐵,可以組成什麼樣有趣的科學小實驗呢?在Amazing Science YouTube頻道中,就出現這麼樣一個讓大人、小孩都驚奇的科學實驗。實驗者將磁鐵吸附在電池正負兩極,放進銅線圈後,電池居然成了跑得飛外的電動小火車。
材料如圖,請注意別買到漆包線喔!
究 竟背後的原理是什麼呢?根據一位擁有物理、工程博士學位的網友寫在紙巾上的圖解,這個現象與大家從小就知道的「磁鐵同極相斥、異極相吸」現象有關。當吸附 著磁鐵的電池進入銅線圈後,由於電流的產生,在銅線圈所形成的磁場,與電磁鐵之間的相吸、相斥,造就了電池的移動。再直白一點來說,就是正極、負極的電流 沿著銅線移動,與電池上的磁鐵彼此相互牽引、排斥,成了那隻看不見的手,推動著電池順暢的奔跑前進。
引用網址:
http://www.damanwoo.com/node/85612
World's Simplest Electric Train 【世界一簡単な構造の電 ...
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