Although the evidence is weak, there has been concern in recent years over possi

Question

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 20m above the ground and carries a current of 200A. Estimate the magnetic field strength on the ground underneath such a line.>style="color: rgb(0, 128, 0); font-family: trebuchet ms,verdana,arial,helvetica,sans-serif; font-size: small;"> id="mathjax_msie_frame">> 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 20m above the ground and carries a current of 200A. Estimate the magnetic field strength on the ground underneath such a line.>style="color: rgb(0, 128, 0); font-family: trebuchet ms,verdana,arial,helvetica,sans-serif; font-size: small;"> id="mathjax_msie_frame"> 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 20m above the ground and carries a current of 200A. Estimate the magnetic field strength on the ground underneath such a line.>style="color: rgb(0, 128, 0); font-family: trebuchet ms,verdana,arial,helvetica,sans-serif; font-size: small;">

Explanation / Answer

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B = (4pi X 10^-7)(200)/(2pi)(18)

B = 2.22 X 10^-6 T

That is 2.22 X 10^-6/50 X 10^-6 = .0444, or 4.44% of the earths magnetic field

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