• Support PF! Buy your school textbooks, materials and every day products Here!

Flux and nonconducting shells

  • #1

Homework Statement



Flux and nonconducting shells. A charged particle is suspended at the center of two concentric spherical shells that are very thin and made of nonconducting material. Figure (a) below shows a cross section. Figure (b) below gives the net flux Φ through a Gaussian sphere centered on the particle, as a function of the radius r of the sphere. The scale of the vertical axis is set by Φs = 17.0 × 10^5 N·m^2/C. (a) What is the charge of the central particle? Give your answers in µC. What are the net charges of (b) shell A and (c) shell B?

http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c23/pict_23_12.gif


Homework Equations



EoI = qenc

The Attempt at a Solution



So I got the measurement of each scale on the graph by dividing Φs by 5 which gave me: 3.4x10^5 N m^2/C

For a) I used EoI = qenc and got 6.018 C which was correct.

now for part b) I found the flux to be -13.6x10^5 N m^2/C. Now finding that I was able to find the q for that area. I found the area to be -1.2036x10^5 C. Now in order to find the net charge for shell a, I subtracted the charge of the central particle which was found in part a) to the charge found in part b) which gave me -1.8054x10^-5 C. But that answer was wrong.

I must have the logic wrong for part b). Can anyone help me out :)
 

Answers and Replies

  • #2
collinsmark
Homework Helper
Gold Member
2,894
1,232
Are you sure that you are entering your data in units of [tex] \mu C [/tex]?
 
  • #3
yes I have converted them to nano C
 
  • #4
collinsmark
Homework Helper
Gold Member
2,894
1,232
yes I have converted them to nano C
Don't you mean micro coulombs? For example, if your calculated answer was -1.8054x10^-5 C, which is -18.054x10-6 C, which is -18.054 µC, meaning you should enter in -18.054.

(It says in the problem statement, "Give your answers in µC.")
 

Related Threads on Flux and nonconducting shells

  • Last Post
Replies
6
Views
951
  • Last Post
Replies
8
Views
3K
  • Last Post
Replies
17
Views
26K
Replies
2
Views
6K
Replies
1
Views
5K
Replies
1
Views
22K
Replies
3
Views
926
Replies
14
Views
8K
Replies
9
Views
14K
Replies
0
Views
3K
Top