16-08-2012, 11:12 AM
Gauss’s Law
Gauss’s Law.pptx (Size: 1.56 MB / Downloads: 150)
Learning Goals - we will learn: CH 22
• How you can determine the amount of charge within a closed surface by examining the electric field on the surface!
• What is meant by electric flux and how you can calculate it
• How to use Gauss’s Law to calculate the electric field due to a symmetric distribution of charges.
Use the following recipe for Gauss’s Law problems:
1. Carefully draw a figure - location of all charges, direction of electric field vectors E
2. Draw an imaginary closed Gaussian surface so that the value of the magnitude of the electric field is constant on the surface and the surface contains the point at which you want to calculate the field.
3. Write Gauss Law and perform dot product E . dA
4. Since you drew the surface in such a way that the magnitude of the E is constant on the surface, you can factor the |E| out of the integral.
5. Determine the value of Qencl from your figure and insert it into Gauss's equation.