9. Ferromagnetic sphere with saturation magnetization M3=0.6 is placed in resonant cavity tuned to 10 GHz and a resonant absorption is observed at the field H=1000 Oe. Find the uniaxial anisotropy constant K of the material when the microwave field is applied perpendicular to the applied DC field H

9. Ferromagnetic sphere with saturation magnetization M3=0.6 is placed in resonant cavity tuned to 10 GHz and a resonant absorption is observed at the field H=1000 Oe. Find the uniaxial anisotropy constant K of the material when the microwave field is applied perpendicular to the applied DC field H

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter22: Magnetism

Section: Chapter Questions

Problem 26PE: Calculate the Hall voltage induced on a patient’s heart while being scanned by an MRI unit....

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Similar questions

A nonmechanical water meter could utilize the Hall effect by applying a magnetic field across a metal pipe and measuring the Hall voltage produced. What is the average fluid velocity in a 3.00-cm-diameter pipe, if a 0.500-T field across it creates a 60.0-mV Hall voltage?
A patient in an MRI unit turns his head quickly to one side and experiences momentary dizziness and a strange taste in his mouth. Discuss the possible causes.
Unreasonable results To construct a non-mechanical water meter, a 0.500-T magnetic field is placed across the supply water pipe to a home and the Hall voltage is recorded, (a) Find the flow rate through a 3.00-cm-diameter pipe if the Hall voltage is 60.0 mV. (b) What would the Hail voltage be for the same flow rate through a 10,0-cm- diameter pipe with tire same field applied?
Integrated Concepts If electric and magnetic field strengths vary sinusoidally in time, being zero at t = 0, then E = E0 sin 2ft and B = B0 sin 2 ft. Let f = 1.00 GHz here. (a) When are the field strengths first zero? (b) When do they reach their most negative value? (c) How much time is needed for them to complete one cycle?
Integrated Concepts A very large, superconducting solenoid such as one used in MRI scene, stores 1.00 MJ of energy in its magnetic field when 100 A flows. (a) Find its serf-inductance. (b) If the coils “go normal,” they gain resistance and start to dissipate thermal energy. What temperature increase is produced it all the stored energy goes into heating the 1000 kg magnet, given its average speci?c heat is 200 J/kg(°C?
(a) An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner's 2.00 T field with his fingers pointing in the direction of the field. Find the average emf induced in his wedding ling, given its diameter is 2.20 cm and assuming it takes 0.250 s to move it into the field. (b) Discuss whether this current would significantly change the temperature of the ring.
Integrated Concepts To construct a nonmechanical water meter, a 0.500T magnetic field is placed across the supply water pipe to a home and the Hall voltage is recorded. (a) Find the flow rate in liters per second through a 3.00-cm-diameter pipe if the Hall voltage is 60.0 mV. (b) What would the Hall voltage be for the same flow rate through a 10.0-cm-diameter pipe with the same field applied?
Review. One insulated conductor from a household extension cord has a mass per length of 19.0 g/m. A section of this conductor is held under tension between two clamps. A subsection is located in a magnetic field of magnitude 15.3 mT directed perpendicular to the length of the cord. When the cord carries an AC current of 9.00 A at a frequency of 60.0 Hz, it vibrates in resonance in its simplest standing-wave vibration mode. (a) Determine the relationship that must be satisfied between the separation d of the clamps and the tension T in the cord. (b) Determine one possible combination of values for these variables.
A mass spectrometer is being used to separate common oxygen- 16 from the much rarer oxygen-18, taken from a sample of old glacial ice. (The relative abundance of these oxygen isotopes is related to climatic temperature at the time the ice s deposited.) The ratio of the masses of these two ions is 16 to 18, the mass of oxygen-16 is 2.661026kg, , and they are singly charged and travel at 5.00106m/s in a 1.20-T magnetic field. What is the separation between their path when they hit a target after travet5ing a semicircle?
Calculate the Hall voltage induced on a patient’s heart while being scanned by an MRI unit. Approximate the conducting pain on the heart wall by a wire 7.50 cm long that moves at 10.0 cm/s perpendicular to a 1.50T magnetic field.
Explain how magnetic flux can be zero when the magnetic field is not zero.
Find the intensity of an electromagnetic wave having a peak magnetic field strength of 4.00109T.