Part A In MRI, the transverse relaxation time measures how long it takes precessing protons to get out of phase with each other so that their individual magnetic dipole moments no longer add up to a macroscopic magnetization. In a 2.5 T MRI machine, how many precessions does a proton make in deoxygenated whole blood during the transverse relaxation time? να ΑΣΦ' N = precessions 国
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- A current of 5.72 A flows along a wire with = (1.382 - 2.095 ) m. The wire resides in a uniform magnetic field B = (-0.350 +0.700 ) T. What is the magnetic force acting on the wire? (Express your answer in vector form.) NA charged particle is introduced into a uniform magnetic field Bz = 0.5 mTesla with an initial velocity vx = 1 x 106 m/s. It’s subsequent trajectory describes a circle with radius r = 2.4 cm. What is the specific charge q/m of this particle in terms of e/m = 1.67 x 1011C/kg? Select one: a. 3e/m b. e/2m c. e/3m d. 2e/mMagnetic and electric field lines are in many ways similar, with few crucial differences. Which of the properties listed below does NOT apply to both fields? O All of these properties apply to both E and B field lines. The density of lines is proportional to the field strength in that area. Field lines never intersect. Tangent to the line at a point gives you the direction of the field as that point. O Field lines form closed loops.
- Part B A particle with charge 8.26 x 10-8 C is moving in a region where there is a uniform 0.600 T magnetic field in the +x-direction. At a particular instant, the velocity of the particle has components Vz = -1.80 x 104 m/s, vy = -3.11 x 104 m/s, and vz = 6.35 x 104 m/s. What is the y-component of the force on the particle at this time? Express your answer with the appropriate units. HA х.101 X Fy = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 9 attempts remaining Part C What is the z-component of the force on the particle at this time? Express your answer with the appropriate units. µA F = Value Units Submit Request AnswerPart D A particle with charge – 5.10 nC is moving in a uniform magnetic field B= -(1.26 T )k. The magnetic force on the particle is measured to be Calculate the scalar product v· F. Assume the velocity has only components found in the previous parts. F = -( 3.10x10-7 N )ê+(7.60x10-7 N )3. Express your answer in meters per second times newtons. Nνα ΑΣφ ? m/s N Submit Request Answer Part E What is the angle between v and F? Give your answer in degrees. Express your answer in degrees. ? = Submit Request Answer Provide FeedbackA flat copper ribbon 0.330 mm thick carries a steady current of 44.0 A and is located in a uniform 1.80 T magnetic field directed perpendicular to the plane of the ribbon. If a Hall voltage of 9.60 μV is measured across the ribbon, what is the charge density of the free electrons? m-³ What effective number of free electrons per atom does this result indicate?
- A magnetic sensor is mounted on a robotic spacecraft that is moving with velocity v in the direction of the Large Magellanic Cloud. A cloud of stray positive ions from the solar wind, also moving in the same direction with velocity v, surrounds the spacecraft. The software on the spacecraft sets up the magnetic sensor to measure the magnetic field of the cloud of positive ions. Which of the following statements is correct (select all that apply)? O The reading on the spacecraft's magnetic field sensor will show a value that is proportional to the total mass of the ion cloud O The reading on the spacecraft's magnetic field sensor will show a value that is proportional to the volume of the ion cloud O The reading on the spacecraft's magnetic sensor will show a value that is proportional to the total amount of charge in the ion cloud O The magnetic field produced by the ion cloud is not detectable by the spacecraft's magnetic sensorProblem A. A sketch below shows a mass spectrometer, that consists of a velocity selector and a deflection chamber. The magnitude of a magnetic field in both the velocity selector and the deflection chamber is 0.030 T. A proton that goes through this setup will have the radius of its trajectory equal to 0.150 m. Find the electric field strength inside the velocity selector.A proton moves with a velocity of = (6î – 4ĵ + k) m/s in a region in which the magnetic field is B = (1 + 2ĵ – k) T. What is the magnitude of the magnetic force this particle experiences? N Need Help? Read It Watch It