Day 11: Gauss' Law

  First, we use arbitrary surface and the line of flux in and out of the surface to find the charge enclosed of three circles.

  Q is proportional to flux. Then we found the unit for k is c^2/(Nm^2).

  After, we found the relationship between q/e_{o and E*A.}

  The black net in the picture is called Faraday cage. We need to predict what will happen to the foils after the cylinder charged. 

  Our predict is correct, only the outer foils will move away from the cylinder.

  Q is on the surface when cylinder is charged.

  The relationship between σ and E0.

  When radius is double, how perimeter, area and volume will change.

  This picture shows the Gauss' law.

  This picture shows the relationship between E, q, and r after we plugged in 4pi*r^2 as area.

  We used Gauss' law to find spherically symmetric charge distributions and the electric field. 

  In this experiment, professor put a ball into the microwave and we saw it fires. Then professor put a CD into the microwave, it broke and bubble fires inside.

  We found the volume by using pi, r and L, charge with a radius of r/2 and total charge Q. Also, we found the surface area of the cylinder.

  In the last two picture, we found the electric field on the circle.

Conclusion:
  Today, we did a lot interesting experiments.We analyze the Gauss' law and showed how it works in real life.After, we figure out the relationship between electric field give the charges of Gauss'law with different materials. Also, we put different things and materials into the microwave and see what will happen. Last, we did some interesting exercises relate to electric field.