Gauss's Law Homework: Find Surface Charge Density

  • Thread starter Thread starter musicman05
  • Start date Start date
  • Tags Tags
    Gauss's law Law
musicman05
Messages
4
Reaction score
0

Homework Statement


On a clear, sunny day, a vertical electrical field of about 116 N/C points down over flat ground. What is the surface charge density on the ground for these conditions?


Homework Equations





The Attempt at a Solution


116*8.83e-12= 1.0266e-9
 
Physics news on Phys.org
That's not much of an explanation of what you did. The interior of the ground is approximately a conductor. You want the effect of the surface charge layer to produce 116V/m above the ground and 0V/m below it when added to the external field.
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

Electric field of a neutral conductor just at the surface
Replies
4
Views
948
Magnetic Field of Uniformly Magnetized Infinite Slab
Replies
6
Views
1K
Why Does Gauss' Law Yield Different Results for Spherical Charge Distributions?
Replies
9
Views
2K
Using Gauss' law to find the induced surface charge density ##\sigma##
Replies
2
Views
2K
I Gauss' Law - Does it apply even when there are external fields?
Replies
9
Views
2K
Getting electric potential from charge density over whole sp
Replies
1
Views
1K
Use of imaginary charge vs Gauss' law
Replies
12
Views
890
Induced surface charge density
Replies
2
Views
9K
I Thought I Understood Gauss' Law (Sheets)
Replies
26
Views
2K
Surface bound charge on the outer surface of a dielectric
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top