Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indicated that a magnetic field of magnitude 1.50 x 10-3 T, oscillating at 60 Hz, might stimulate red blood cells become cancerous. If the diameter of a red blood cell is 7.5 µm, determine the maximum emf that can be generated around the perimeter of the cell. 2.839E-11 X Your response differs from the correct answer by more than 10 %. Double check your calculations. V

Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indicated that a magnetic field of magnitude 1.50 x 10-3 T, oscillating at 60 Hz, might stimulate red blood cells become cancerous. If the diameter of a red blood cell is 7.5 µm, determine the maximum emf that can be generated around the perimeter of the cell. 2.839E-11 X Your response differs from the correct answer by more than 10 %. Double check your calculations. V

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter23: Faraday’s Law And Inductance

Section: Chapter Questions

Problem 4P

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A parallel-plate capacitor with plate separation d is connected to a source of emf that places a time-dependent voltage V(t) across its circular plates of radius r0and area (a) Write an expression for the time rate of change of energy inside the capacitor in terms of V(t) and dV(t)/ dt. (b) Assuming that V(t) is increasing with time, identify the directions of the elecuic field lines inside the capacitor and of the magnetic field lines at the edge of the region between the plates, and then the direction of the Poynting vector S at this location. (c) Obtain expressions for the time dependence of E(t), for B(t) from the displacement current, and for the magnitude of the Poynting vector at the edge of the region between the plates. (d) From S , obtain an expression In terms of ‘(t) and dV(t)/dt for the rate at which electromagnetic field energy the region between the plates. (e) Compare the results of pails (a) and (d) and explain the relationship between them.
Using an electromagnetic flowmeter (Fig. P19.69), a heart surgeon monitors the flow rate of blood through an artery. Electrodes A and B make contact with the outer surface of the blood vessel, which has interior diameter 3.00 mm. (a) For a magnetic field magnitude of 0.040 0 T, a potential difference of 160 V appears between the electrodes. Calculate the speed of the blood. (b) Verify that electrode A is positive, as shown. Does the sign of the emf depend on whether the mobile ions in the blood are predominantly positively or negatively charged? Explain. Figure P19.69
A metal bar of length 25 cm is placed perpendicular to a uniform magnetic field of strength 3 T. (a) Determine the induced emf between the ends of the rod when it is not moving, (b) Determine the emf when the rod is moving perpendicular to its Length and magnetic field with a speed of 50 cm/s.
Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indicated that a magnetic field of magnitude 1.10 x 10-3 T, oscillating at 60 Hz, might stimulate red blood cells to become cancerous. If the diameter of a red blood cell is 7.7 μm, determine the maximum emf that can be generated around the perimeter of the cell. V
Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indicated that a magnetic field of magnitude 1.50 x 10-3 T, oscillating at 60 Hz, might stimulate red blood cells to become cancerous. If the diameter of a red blood cell is 8.4 μm, determine the maximum emf that can be generated around the perimeter of the cell. 3.73 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. V Need Help? Read It Submit Answer
Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indicated that a magnetic field of magnitude 1.0 × 10-3 T, oscillating at 60 Hz, might stimulate red blood cells to become cancerous. If the diameter of a red blood cell is 8.0 mm, determine the maximum emf that can be generated around the perimeter of the cell.
Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indicated that a magnetic field of magnitude 1.30 x 10³T, oscillating at 60 Hz, might stimulate red blood cells to become cancerous. If the diameter of a red blood cell is 7.9 µm, determine the maximum emf that can be generated around the perimeter of the cell. 7.65E-12 Your response differs from the correct answer by more than 10%. Double check your calculations. V
A TMS (transcranial magnetic stimulation) device creates very rapidly changing magnetic fields. The field near a typical pulsed-field machine rises from 0 T to 2.5 T in 200 μs. Suppose a technician holds his hand near the device so that the axis of his 1.9-cm-diameter wedding band is parallel to the field. What emf is induced in the ring as the field changes? If the band is made of a gold alloy with resistivity 6.2×10−8Ω⋅m and has a cross-section area 4.5 mm2 , what is the induced current?
At a particular place on the surface of the Earth, the Earth's magnetic field has magnitude of 5.45 x 10-5 T, and there is also a 128 V/m electric field perpendicular to the Earth's surface. (a) Compute the energy density of the electric field. (Give your answer in nJ/m³.) nJ/m³ (b) Compute the energy density of the magnetic field. (Give your answer in μJ/m².) µJ/m³
b. It has been suggested that birds might use the EMF induced between their wing tips by the earth's magnetic field as a means of helping them navigate during migration. What EMF would be induced for a Canada goose with a wingspread of 1.5 m flying 10 m/s in a region where the vertical component of the earth's field is 30 µT?
A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 x 1012 V/m.s. The magnetic field at a point 1.2 m from the axis has a magnitude of: O OT O 7.0 x 10-6 T O 1.1 x 10-5 T O 2.3 x 10-5 T O 2.8 x 10-5 T
Currents in dc transmission lines can be 100 A or higher. Some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. For a line that has current 150 A and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? Express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 G. Is this value cause for worry?