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Angie K.
- 108
- 1
Homework Statement
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.
Homework Equations
B=mu0*I/2 pi r
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!