磁場および電場中の電子線の様子をシミュレートします．

Ctrlキーと十字キー(↑↓)で磁場の強さが変わります．
Shiftキーと十字キー(↑↓)で電場の強さが変わります．
Ctrl + Shiftキーと十字キー(↑↓→←)で電子銃の向きが変わります．
十字キー単独(↑↓→←)で電子銃の位置が変わります．
マウススクロールで電子の速度が変わります．
画面をマウスドラッグすると全体を回転できます．

This application shows you how the movement of charged particle is affected by an electromagnetic field.
The white tube is the electron gun. The green line represents an electron beam.

You can apply a magnetic field by pressing the ctrl key + arrow(↑↓) key.
You can apply an electric field by pressing the shift key + arrow(↑↓) key.
You can change the direction of electron gun by pressing the ctrl + shift + arrow(↑↓←→) keys.
You can change the position of the electron gun by pressing the arrow(↑↓←→) keys only.
You can change the velocity of electron by scrolling the mouse.
You can change the viewpoint by dragging the mouse.