Sunday, 24 September 2017

homework and exercises - Calculating the electric field of an infinite flat 2D sheet of charge



I was trying to calculate the electric field of an infinite flat sheet of charge. I considered the sheet to be the plane z=0 and the position where the electric field is calculated to be (0,0,z0), I know that the electric field from a line charge is with charge density λ is E(r)=λ2πrϵ0. I ended up with this integral: σ2πϵ0x2+z20(xx2+z20i+z0x2+z20k)dx=σ2πϵ0(x2+z20)(xi+z0k)dx.

The z-component gives the correct answer. σ2πϵ0(x2+z20)z0dx=σ2πϵ0arctan(xz0)|=σ2ϵ0.
But when I wanted to verify that the x-component is zero, I encountered a divergent integral.σ2πϵ0(x2+z20)xdx=ln(x2+z20)|.
Why is that? Where am I getting wrong?





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