a.) Beale Air Force Base in Marysville hosts one of the nation's critical early warning radar systems. Named PAVE PAWS, it is designed to detect and track submarine- launched ballistic missiles originating from the Pacific Ocean. It operates at frequency 420 MHz and has an average power of 146 kW. Determine the magnitudes of the electric and magnetic field amplitudes at a distance of 10 km from the radar face. (Assume the radiation forms a uniform hemispherical shape.)
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- 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)Patients undergoing an MRI occasionally report seeing flashes of light. Some practitioners assume that this results from electric stimulation of the eye by the emf induced by the rapidly changing fields of an MRI solenoid. We can do a quick calculation to see if this is a reasonable assumption. The human eyeball has a diameter of approximately 25 mm. Rapid changes in current in an MRI solenoid can produce rapid changes in field, with ΔB/Δt as large as 50 T/s. What emf would this induce in a loop circling the eyeball? How does this compare to the 15 mV necessary to trigger an action potential?2. A time-dependent magnetic field is directed perpendicular to a given circular section of a solenoid. This magnetic field is confined to a cylindrical volume of radius R = 5.0 cm such that the magnetic field, B = 0 for radial distances r> R. Find the rate of change of the magnetic field that will result in an induced electric field of magnitude E = 0.5 V/m at radial distance, r =7.0 cm (outside the section). [-28 T/s]
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