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.
Part A
For a line that has current 190 A and a height
of 8.0 mm above the ground, what magnetic field does
the line produce at ground level? Express your answer in
teslas.
B=____T
Part 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=____%
Part C
Is this value of magnetic field cause for worry?
a) Yes. Since this field does not differ a lot from the earth's
magnetic field, it would be expected to have almost the same effect
as the earth's field.
b) No. Since this field does not differ a lot from the earth's
magnetic field, it would be expected to have almost the same effect
as the earth's field.
c) Yes. Since this field is much greater than the earth's
magnetic field, it would be expected to have more effect than the
earth's field.
d) No. Since this field is much smaller than the earth's
magnetic field, it would be expected to have less effect than the
earth's field.