1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Finding charge of insulating sphere and conductor

  1. Sep 18, 2009 #1
    1. The problem statement, all variables and given/known data

    For the configuration shown in the figure below, suppose that a = 6.10 cm, b = 21.6 cm, and c = 26.6 cm. Furthermore, suppose that the electric field at a point 11.5 cm from the center is 3.37x10^3 N/C radially inward, while the electric field at a point 58.6 cm from the center is 1.30x10^2 N/C radially outward.I can't copy picture so i will describe it. In the middle there is a sphere with radius a, it is an insulator. There is an outer ring around this sphere which has radius b. Than the last ring is the outermost ring with radius c. The last ring is a conductor.

    (a) find the charge of the insulating sphere
    (b) the net charge on the hollow conducting sphere.

    2. Relevant equations

    k_e(Coloumb constant) = 8.99 x 10^9 Nm^2/C^2

    3. The attempt at a solution

    What i did was since the second ring there is an electric field of 3.37x10^3N/C which is given, i calculated q using the equation about. Than the innermost sphere charge should be the opposite of that.
  2. jcsd
  3. Sep 18, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Hi phanman, welcome to PF.

    There is no configuration "shown below." Without it, we cannot help you.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook