Question: Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by electric transmission lines.

Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by electric transmission lines. A typical high-voltage transmission line is 20 m above the ground and carries a 200 A current at a potential of 110 kV.
a. What is the magnetic field strength on the ground directly under such a transmission line?
b. What percentage is this of the earth’s magnetic field of 50 μT?

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