?簡??????磁鐵製????且簡??小?馬???/p>
???電磁正極???極???中??割了?端???磁?線??而產???倫茲?使??????/p>
????顛倒放置????????否????
馬?
Fundamentals of Physics, Halliday
?旻峰、鄭???陳?中???良
徐?谷、陳宜駿
?昭????/p>