Calculating Electric Flux Leaving a Sphere from Point and Line Charges

yoamocuy
Messages
37
Reaction score
0

Homework Statement


A point charge of 20 nC is located at (4,-1,-3), and a uniform line charge of -25nC/m lies along the intersection of the planes x=-4 and z=6. (a) Calculate D at (3,1,0). (b) How much electric flux leaves the surface of a sphere of radius 5, centered at the origin? (C) Repeat part b if the radius of the sphere is 10.

Homework Equations


Q=total flux enclosed


The Attempt at a Solution


I've already solved part a without a problem but its b and c that are giving me trouble. I seem to be having problems with Gauss's law. A sphere of radius 5 seems like it would enclose the 20nC point charge so wouldn't electric flux simply equal 20 nC. The answer seems to be 0 though.
 
Physics news on Phys.org
You didnt calculate the line charge enclosed by the sphere...
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

Flux of Electric field through sphere
Replies
2
Views
2K
Flux through a cylindrical surface enclosing part of a sphere
Replies
9
Views
556
Electric field of a neutral conductor just at the surface
Replies
4
Views
1K
Electric Field Flux Question
Replies
4
Views
757
Electric Flux Through the Surface of a Circle
Replies
6
Views
8K
Electric flux through a surface placed between
Replies
6
Views
2K
Electric Flux on the surface of a sphere
Replies
2
Views
2K
If closed integral of E.dS is zero over a surface, then...?
Replies
14
Views
891
[Griffiths ex4.2] Electric field of a uniformly polarized sphere
Replies
4
Views
4K
Electrostatic Potential Energy of a Sphere/Shell of Charge
Replies
2
Views
4K

Hot Threads

Recent Insights

Back
Top