Concept #1: Electric Flux
Practice: The electric flux through each surface of a cube is given below. Which surfaces of the cube does the electric field run parallel to?
Φ1 = 100 Nm2 /C Φ4 = 0 Nm2 /C
Φ2 = 20 Nm2 /C Φ5 = −40 Nm2 /𝐶
Φ3 = 0 Nm2 /C Φ6 = −80 Nm2 /𝐶
Example #1: Flux Through Angled Surface
Example #2: Flux Through Cube
Practice: Where does the normal vector point for a spherical shell?
Example #3: Flux Through Spherical Shell due to Point Charge
Practice: What is the total flux through the two surfaces depicted in the following figure? Note that surface 1 has an area of 50 cm2 and surface 2 has an area of 100 cm2 , and E = 500 N/C.