1. The problem statement, all variables and given/known data Consider a platinum wire (σ = 1.0e+7) with a cross-sectional area of 1 mm^2 (similar to your connecting wires) and carrying 0.3 amperes of current, which is about what you get in a circuit with a round bulb and two batteries in series. Calculate the strength of the very small electric field required to drive this current through the wire. 2. Relevant equations σ=qnu I=qnAuE Therefore I=σAE where phi is the conductivity A the cross sectional area and E the electric field 3. The attempt at a solution This seemed easy but i got an answer of 3e-5 and that is incorrect?