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Power lines produce both electric and magnetic fields. The interior of the human body is an electrical conductor, and as a result, electric fields are greatly reduced in magnitude within the body The electric fields inside the body from are much smaller than electric fields normally existing in the body However, magnetic fields are not reduced in the body. Earth's magnetic field, approximately 5 × 10-5 T, is very small and not regarded as a health threat. Thus, it is interesting to compare Earth's magnetic field to fields produced by high power lines The magnetic field from a high-voltage power line located 40 m above the ground carrying a 100-A current is much smaller than Earth's-B field Wires that provide electric power appliances also produce electric and magnetic fields. The current in the wire for a 500-W space heater is about 5 A. With the wire located several meters from your body, the magnetic field of such an appliance is somewhat smaller than Earth's magnetic field. By comparison, laboratory mice lived for several generations in 0.0010-T magnetic fields (20 times Earth's magnetic field) without any adverse effects During the last three decades, electric power use has increased the magnitudes of the-B field created by power lines to which Americans are exposed by roughly a factor of 20. Yet during that same time interval, leukemia rates have slowly declined. It seems unlikely that magnetic fields produced by home appliances or high-voltage power lines are a hazard Part A Full Solution Problemwhat to show & do Complete a full solution in which you use your physics knowledge to make a judgement about the safety risks of magnetic fields from power lines. You can do this by comparing the magnetic field from the power line to Earth's magnetic field (which is safe for us). To show your work: power lines +1 Sketch & Translate: Draw a sketch of the power line and Earth's magnetic fields and relevant information. Include a coordinate axis (with N direction labeled) +1 Simplify & Diagram: Create a diagram of the magnetic field generated by the current-carrying wire Show it in two views in one view, the wire should be a straight line in the plane of the page, in another view, the current should be coming out of the page +1 Represent Mathematically: Choose & write the equation that will help you determine the magnetic field from the +1 Solve: Find the magnitude of the magnetic field through your head, if you are 1.5 m tall (and the power line is 40 m above ground) +1 Evaluate: Compare this magnitude to that of Earth's magnetic field. Should you be concerned about the magnetic field from the current in the power line? power line wire as that magnetic field passes through you for household Optional if you'd like to check your answer, find the ratio of the magnetic field that you found to Earth's magnetic field and enter it on the box below: Express your answer using two significant figures B/BEarth Submit My Answers Give Up Feedback Continue

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