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## Homework Statement

(first of all, let me know if I am wrong in any parts)

gauss's law can be used on cylinder.

Why is it that flux on top and flux on bottom of the cylinder, with area pi*r^2 ignored? (aka, equal to 0)

such that

Flux= Integral(E*da)=E2(pi)rl=q/(Eo)

where (Eo) is permitivity of/in vacuum.

## Homework Equations

Cylinder

Flux= Integral(E*da)=E2(pi)rl=q/(Eo)

Sphere

Flux= Integral(E*da)=E2(pi)r^2=q/(Eo)