EMF. Currents in dc transmission lines can be 100 A or more. Some people have ex

Question

EMF. Currents in dc transmission lines can be 100 A or more. Some people have expressed concern that the electromagnetic fields (EMFs) from such lines near their homes could cause health dangers.

For a line with current 180A and at a height of 8.0m above the ground, what magnetic field does the line produce at ground level? Express your answer in teslas.

B = ______ T

What magnetic field does the line produce at ground level as a percent of the earth's magnetic field, which is 0.50 gauss.

B/Be = _______%

Explanation / Answer

a)B=0I/2r=4.5*10-6T

b)B/Be=4.5*10-6/0.5*10-4*100=9%

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