A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 5.50 km from the source, a detector measures the intensity of the wave to be 26.0 μμW/m2. What is the peak value of the magnetic field at the detector due to the wave?

Irrigation channels that require regular flow monitoring are often equipped with electromagnetic flowmeters in which the magnetic field is produced by horizontal coils embedded in the bottom of the channel. A particular coil has 100 turns and a diameter of 6.0 m. When it's time for a measurement, a 4.5 A current is turned on. The large diameter of the coil means that the field in the water flowing directly above the center of the coil is approximately equal to the field in the center of the coil. The field is directed downward and the water is flowing east. The water is flowing above the center of the coil at 1.5 m/s. What is the magnitude of the field at the center of the coil? What is the magnitude of the force on an ion with a charge +e?

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 1.40 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 7.6 μm, determine the maximum emf that can be generated around the perimeter of the cell. V

A low-frequency radio wave is oscillating at a rate of 60 MHz with a peak electric field of 120 N/C. Which of the following functions is the correct excpression for the magnetic field? а. 2л B (x,t) =40µTsin -(1.2x)(10'). b. B (x,t) =0.40µTsin 2л Ос. B (x,t) =4.0µTsin 2 1.2)(10), Od. В (х,1) %3D0.40диTsin| (1.0) е. B (x,t) =0.40µTsin (1.2)