Magnetic resonance imaging (MRI) is a medical technique for producing "pictures" of the interior of the body. The patient is placedwithin a strong magnetic field. One safety concern is what would happen to the positively and negatively charged particles in the bodyfluids if an equipment failure caused the magnetic field to be shut off suddenly. An induced emf could cause these particles to flow,producing an electric current within the body. Suppose the largest surface of the body through which flux passes has an area of 0.031m² and a normal that is parallel to a magnetic field of 1.3 T. Determine the smallest time period during which the field can be allowed tovanish if the magnitude of the average induced emf is to be kept less than 0.014 V.B (out of screen)Number iUnits>

To find the smallest time period during which the magnetic field can be allowed to vanish without…

Answered: Magnetic resonance imaging (MRI) is a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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During a transcranial magnetic stimulation (TMS) treatment, a magnetic field, typically of magnitude 5.00 T, is produced in the brain using external coils. During the treatment, the current in the coils (and hence the magnetic field in the brain) rises from zero to its peak in about 65.0 us . Assume that the magnetic field is uniform over a circular area of diameter 2.00 x 10-² m inside the brain. What is the magnitude of the average induced emf around this region of the brain during the treatment? average induced emf: V
A velocity selector consists of electric and magnetic fields described by the expressions E= Ek and B= B ĵ, with B = 17.0 mT. Find the value of E such that a 800-eV electron moving in the negative x direction is undeflected. kV/m
Using an electromagnetic flowmeter, 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 3.30 mm. For a magnetic field magnitude of 0.020 0 T, a potential difference of 110 μV appears between the electrodes. (a) Calculate the speed of the blood.
A doctor monitors the flow rate of blood using an electromagnetic flowmeter. Electrodes A and Bmake contact with the outer surface of the blood vessel which has a diameter of 3 milimeters. For a magnetic field of 0.02T, an emf of 1.2 x 104V is measured between the electrodes. Calculate the speed of the blood in m/s. (The blood flow is out of the page.) Artery To voltmeter Blood Electrodes B flow Answer:
Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field inside the brain. The induced emf can be sufficient to stimulate neuronal activity. One such device generates a magnetic field within the brain that rises from zero to 1.1 T in 100 ms. Determine the magnitude of the induced emf within a circle of tissue of radius 1.6 mm and that is perpendicular to the direction of the field. e = mV
Magnetic resonance imaging (MRI) is a medical technique for producing "pictures" of the interior of the body. The patient is placed within a strong magnetic field. One safety concern is what would happen to the positively and negatively charged particles in the body fluids if an equipment failure caused the magnetic field to be shut off suddenly. An induced emf could cause these particles to flow, producing an electric current within the body. Suppose the largest surface of the body through which flux passes has an area of 0.041 m2 and a normal that is parallel to a magnetic field of 2.0 T. Determine the smallest time period during which the field can be allowed to vanish if the magnitude of the average induced emf is to be kept less than 0.010 V.
A betatron is a device that accelerates electrons to energies in the MeV range by means of electromagnetic induction. Electrons in a vacuum chamber are held in a circular orbit by a magnetic field perpendicular to the orbital plane. The magnetic field is gradually increased to induce an electric field around the orbit. (a) Show that the electric field is in the correct direction to make the electrons speed up. (b) Assume the radius of the orbit remains constant. Show that the average magnetic field over the area enclosed by the orbit must be twice as large as the magnetic field at the circle’s circumference.
ASAP
Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field inside the brain. The induced emf can be sufficient to stimulate neuronal activity. One such device generates a magnetic field within the brain that rises from zero to 1.5 T in 120 ms. Determine the induced emf within a circle of tissue of radius 1.6 mm and that is perpendicular to the direction of the field.
99. A velocity selector consists of electric and magnetic w fields described by the expressions E Bi, with B = 15.0 mT. Find the value of E such that a 750-eV electron moving in the negative x direction is undeflected. = Ek and B = %3D %3D %3D
Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field inside the brain. The induced emf can be sufficient to stimulate neuronal activity. One such device generates a magnetic field within the brain that rises from zero to 1.6 T in 100 ms. Determine the magnitude of the induced emf within a circle of tissue of radius 2.0 mm and that is perpendicular to the direction of the field. = mV

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