- #1
jackMybrain@ru
- 6
- 1
Homework Statement
Hi, I am stuck with this homework. I have been asked to make an equation out of a diagram for V(z) using V=kQ/r equation, where z is a positive axis centred with four negative charges. Here is the diagram.
2. Relevant equation
E=F/q
F of point charge: F=kQq/r^2
E=kQ/r^2
V=kQq/r ~U=V*q & KE=0.5m*velocity^2
r=distant of the point from the point charge q
k=1/4*pi*[E][/0]
The Attempt at a Solution
I have already completed the (a) and (b) parts. However, for part (b) I could only make V(z)=Q/(4*pi*Enod)*r where r = 0.5*sqrt([d^2+(2Z-d)^2]) from the r12. I found r by taking all point charges distant together by saying r12 of the first 2 charges are equal and r34 of the 3rd and 4th is same. Therefore, Vtotal=KQ*[(2/r12)+(2/r34)]. But how do I make it as V(z)=-Q/pi*Enod... because currently I am getting V(z)=-Q/8*pi*Enod(sqrt([d^2+(2Z-d)^2])).
Am I doing something wrong. Thanks for any insight or solution for the other parts would be very helpful.
And how do I do Q 1. (c),(d)& (f)??
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