Download Name: Electric Flux and Gauss`s Law – Notes 1. Draw the diagram

Name: _______________________________
Electric Flux and Gauss’s Law – Notes
1. Draw the diagram of the electric field and the surface.
2. d =
3. For water, flux is the flow per unit area. For the electric field, flux is the electric field
passing through each unit area.

4. What is the direction of dA ?
5. For a closed surface =
6. Point Charge
A. Draw the diagram
B.  
 
2
E
  dA   E dA  E dA  E 4R
C. ER =

=
7. Gauss’s Law
A.  =
B. For Gauss’ Law to be useful, the charge must be symmetric.
C. The 3 symmetries we will use are: ___________ ___________ ___________
8. Uniformly-Charged Sphere
A. Draw the diagram
B. At any given radius, the magnitude of the electric field is ______________.
C. At any given radius, the electric field’s direction is ______________.
D. The electric field inside a uniformly-charged sphere is equal to ______________.
E. The electric field outside a uniformly-charged sphere is equal to ______________.
F. The electric field outside the sphere is as though all of the charge were
concentrated at ___________________________.
G. Draw the graph of the electric field versus r.
9. Flat Horizontal Plane of Charge
A.  =
B. The Gaussian surface you should use to find E is a ___________________.
C. Draw the diagram.
D. E =
10. Two Oppositely-Charged Parallel Plates
A. Draw the diagram.
B. Draw the electric field lines.
11. How the Electric Field Varies with Distance
A. For an infinitely-large plane, if the electric field at a distance R from the plane is E,
what is the electric field at 3R?
B. For a charged hollow sphere, if the electric field at a distance R from the sphere is
E, what is the electric field at 3R?