EMF. Currents in dc transmission lines can be 100 A or more. Some people have ex
ID: 1492247 • Letter: E
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.
a. For a line with current 130 A and at a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? Express your answer in teslas
B=_____T
b.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) magnetic field the line produce at ground level ,B = 2 * 10-7 * 130/8
= 3.25 * 10-6 T
b) magnetic field the line produce = 3.25 * 10-6 T
= 0.0325 gauss
=> as a percent of the earth's magnetic field = (0.0325/0.50) * 100
= 6.5 %
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