The usual overhead power distribution wires are said to have potential of 230V in a certain locality. (These are voltage levels in wires seen along streets electricity pillars and these enter house of consumers.) How does one calculate magnetic field and electric field produced by the wire at a certain distance, say 5m from the wire? I am confused because when we say 230V, we do not mention, with respect to what this is stated. It becomes easier if current instead of voltage is stated for the wires which however is never the case. Can anybody please help?