The last button says "click here to add an electric field." When you click this button, a field is added, coming from the right side of the screen, as the red arrows indicate. The motion of the electrons changes according to how electrons move under an applied bias. When you add the field, a "slider" appears on the right side of the screen labeled "Field Strength." With the slider, you can adjust the intensity of the field. The button now says "click here to remove the field," and you can click that to remove the affects of the field.

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