1. The problem statement, all variables and given/known data You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that the two wires run about 30 m above the ground and about 2.9 m apart. A call to the local power company provides the information that the lines operate at 10 kV (rms) and provide a maximum of 44 MW to the local area. Estimate the maximum magnetic field you might experience walking under these power lines. 2. Relevant equations B=mu0*I/2 pi r 3. The attempt at a solution Would I be able to find the current from the given power and voltage? Power = V^2/I where V is the voltage (10kV) and I is the unknown current and power is 44 MW Then using that to find the magnetic field B=mu0*I/2 pi r and I'm not sure which value for r to use? Would it be 2.9m/2 because it's the radius I'm interested in? Thanks in advance!