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**I need to use coulombs law to describe the electric field due to a point charge in cylindrical co ordinates. I know the answer should have E = [ρ,0,z] with the azimuth as 0 but I can't show it using the standard electric field equations. please note I need to use E=q/4πε * r/|r|^3 I'm sorry I don't know how to type it all pretty in latex :( it's on my to do list**

**E=q/4πε * r/|r|^3**

**I'm truly perplexed on where to start**

Thanks for all the help!

Thanks for all the help!