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Homework Statement
Halliday and Resnick edition 7 chapter 22 number 29
In Fig 22-45, positive charge q = 7.81 pC is spread uniformly along a thin nonconducting rod of length L = .145m. The y distance between the point and rod is R = .06m. What is the magnitude and direction of the electric field produced at point P.
I will attempt to describe the figure:
There is a thin nonconducting rod in the x dimension with length L and a point P is directly above the center of the rod in the y dimension (R = .06m).
Homework Equations
E = (1/4[tex]\pi[/tex][tex]\epsilon[/tex])(q/r[tex]^{2}[/tex])
The Attempt at a Solution
[tex]\int[/tex]dE = 1/4[tex]\pi[/tex][tex]\epsilon[/tex][tex]\int[/tex][tex]\lambda[/tex]Rdx/(R[tex]^{2}[/tex]+x[tex]^{2}[/tex])[tex]^{3/2}[/tex]
I then took lamba and R out of the integral since they are constants
(4 is not rasied to ([tex]\pi[/tex][tex]\epsilon[/tex])
After taking the integral I got:
([tex]\lambda[/tex]/4[tex]\pi\epsilon[/tex])(x/R(R[tex]^{2}[/tex]+x[tex]^{2}[/tex])[tex]^{1/2}[/tex]
When I plug in for the varibles I do not get the correct answer, I get 7.48 n/C but the correct answer is 12.4 N/C
I plug in L for x and R for R and for [tex]\lambda[/tex] I use q/L