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How can I calculate the electric field from a powerline?

I need to calculate the electric field around a current carrying wire with an AC voltage. I don't know the current, I only know the voltage that is on the wire. For example, the voltage could be [tex]V = |V| e^{i \omega t}[/tex] where [itex]\omega[/itex] is ofcourse the angular frequency of the AC voltage.

Am I right that the direction will always be radial to the wire, irregardless of the change in voltage over time?

Thanks.