We found out the equation E=k*q_2/r^2 by combined the equations F=k*q_1*q_2/r^2 and E=F/q.
This is a 3-D diagram for a proton. As you see, the direction of the electric field is going outward.
There are four steps to found E.
This is our prediction for the electric vector and direction. The second image is the correct electric vector and direction we did by using Vpthon, which is match our prediction.
These are the images of the program we did by using Vpthon.
This is an example problem we did in class. There are two particles on the x-axis. One is positive and the other is negative. We need to use the equation E=k*q/r^2 to found the total E of a special position.
This is another example problem. But we could use Excel to found the total E which was an easy way.
We put an electron on top of the center rod. We still need to found the total E. But first, we need solve Ex and Ey. Then we could solve for the total E which is 110210 N/C. The second image shows a different way to found total E. The answer we got is 60000 N/C which was very close to the answer we got in the Excel 59715 N/C in the first image.
Today, we started with the definition of the electric field. Then we figure out a new equation E=k*q_2/r^2 by combined the equations F=k*q_1*q_2/r^2 and E=F/q. After we found out this equation, we did a very interesting program by using Vpthon. After the programming, we started doing some example problems to solve for total E by using Excel.
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