2 Questiosn On Parallel Plates ?

From: Pib (Pib_at_NugPib.com)
Date: 02/28/05 

Date: Mon, 28 Feb 2005 08:53:27 GMT

1. parallel plate with capacitor of 20uF, plate is 0.5mm apart.

Find
1. Area of each plate
2. potential difference if there's a change of magnitude of 30uC on each plate.
3. stored energy
4. electric field between the two plates
5. charge density on the plate.

  _ _
  |_| |_|
 |_____|
   .5mm

I know C=Eo*A / d

so would A=Eo*C/ D or A=Q / Eo *E

A= (8.85*10^ -12 ) * 20 / (.5 * 10^ -3) ?

2. three point charges on the x axis q1= (10uc) at x= -4m, q2= (-5uC) at the origin, q3= (-20uC) at x= 4m.

Q1(-4,0) Q2(0,0) Q3(4,0)
(+)----------(-)-----------(-)
10uC -5uC -20UC

Find
1. electric field at origin
2. force on q2

would electric field on orgin = Zero or would it be F1= Ke |q1|q2| / r^2 & F2= Ke |q3| |q2| / r^2

F1= (8.99* 10^9) (10 * 10^ -6) * ( 5*10^-6) / (-4)^ 2

F2= (8.99* 10^9) (20 * 10^ -6) * (5*10^-6) / (-4)^ 2

what would i do after this ? x & y components ?

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