Part A Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by transmission lines. A typical high-voltage transmission line is 20 Im off the ground and carries a current of 200 A. Estimate the magnetic field strength on the ground underneath such a line. Express your answer using one significant figure. ΜΕ ΑΣΦ B = Submit Request Answer Part B ? μΤ What percentage of the earth's magnetic field does this represent? (Assume that magnetic field strength at the surface of the earth is 5 × 10-5 T) Express your answer using one significant figure. = Btl BEarth ΑΣΦ ? %

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