Simple parrallel plate capacitor problem?

Discussion in 'General Electronics Chat' started by niceperson, Mar 15, 2008.

  1. niceperson

    Thread Starter New Member

    Mar 15, 2008
    Hi guys,

    i'm a little stuck with this problem:

    'Two connected conducting plates a distance D apart have a charge q placed at a distance b from one of the plates:
    show ratio of charge q induced on the plates is D/D-b and D/b'

    This can be modelled as a sheet of charge instead of a point charge.

    at a distance D-b from plate A and b from plate B (

    E field (e being constant in vacuum) at A then: q/4*pi*e*(D-b)^2
    E field at B: q/4*pi*e*b^2

    but from here i am stuck!