✔ 最佳答案
Q: 電子幾時進入磁場會有圓周運動? 凡係電子經過垂直既磁場就會有圓周運動? 定係1d特定既情況先有?
A: Since the magnetic force is always perpendicular to the plane containing the magnetic field lines and the velocity of the electron. Circular motion is resulted.
Q: 我最想問呢 : keep住比電勢差 粒電子 電子進入垂直既磁場 咁樣又會圓周運動???
A: The subsequent motion of the electron depends on the relative orientations of the electric and magentic field. But the magentic force is always perpendicular to the velocity of the electron.
Q:正製造霍耳電壓時 電子通過垂直磁場 電子既偏轉路徑係咩 ?? 圓周運動??定係曲線?
A: As said above, the magnetic force produces a circular motion t the electrons.
2012-01-28 17:15:12 補充：
My answer given above only applicable to free electrons (自由電子). Electrons flowing in a solid conductor are obstructed by the conductor atoms and their paths are not continuous. Electrons constantly collide with atoms and change their directions of motion....
2012-01-28 17:16:03 補充：
(cont'd)... Thus, even small circular arcs are traversed by these electrons, a complete circular path could never be formed in a solid conductor.
