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 20m above the ground and carries a 200 A current at a potential of 110 kV. What is the magnetic field strength on the ground directly under such a transmission line?Express your answer to two significant figures and include the appropriate units. B =What percentage is this of the earth's magnetic field of 50 ?T?Express your answer to two significant figures and include the appropriate units. Bwire Bearth =-