By giving some sets of data, we draw a graph that showed some relationship between time and their position, and electric force. We will use those relationships to solve the electric constant later. Then we found that electric constant is approach to 8.85 810^-12.
At this moment, we draw the gravity force vs distance graph, and we observe and predict that the electric force may have the similar relationship between distance and column. The only thing we need to solve is to figure the constant out that plays the same role as gravity constant. The constant we named is column constant
By giving electric charge and distance separated, we can figure out the electric force between them. Also, if they are both negative or both positive charged, the force applied to each of them will have the same magnitude but opposite direction making them repelling each other. If they share opposite charge, the force still gonna be same magnitude and opposite direction, but making them attract each other.
When we start this equipment, the top part got charged, which make the paper slip have the same charge as the equipment. Thus, they repel each other.
When we put the steel shelf on the top and let it charged, it starts to spin. The reason it starts to spin is because all charged particles finally move to the sharp end of each branch and repel each other, which make it spin.
This is the prediction we make for the picture above, and the result is same as our prediction, which is spinning clockwise.
Since there is mass of charged particles, and we wonder if we need to consider the influence due to gravity force as well as an electric force even though the mass can be very small. By calculating the ratio of electric force and gravity force, we find that the ratio is very huge. We can see that electric force is much much larger than gravity force, therefore, we can ignore the influences due to gravity force during calculation.
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