1. Not finding help here? Sign up for a free 30min 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!

Electric field and charge.

  1. Sep 4, 2011 #1
    1. The problem statement, all variables and given/known data

    The electric field at the point x = 10.0 cm and y = 0 points in the positive x direction with a magnitude of 10.0 N/C. At the point x = 20.0 cm and y = 0 the electric field points in the positive x direction with a magnitude of 20.0 N/C. Assume that this electric field is produced by a single, point charge.

    (a) Find the location of the point charge.

    (b) Find the sign and magnitude of its charge.

    3. The attempt at a solution

    10 =q/4piε(d+10)^2

    20 = q/4piε(d)^2
    E is more at x=20 , so q must be -ve, and situated beyond x=20

    dividing both eqn , we get
    20/10 = d^2 + 100+ 20d/ d^2
    solving the quadratic eqn , we get
    d= 10±10√2
    d= 24.14cm
    put d= 24.14 in any above formula,

    we get q= -0.13nC

    Both answers are incorrect. I've gone to two different tutors and neither could help. Please help
     
  2. jcsd
  3. Sep 4, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Measure distances in meters, not cm.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Electric field and charge.
Loading...