Physics 30 June 2000 Diploma Exam

An electric field of magnitude 717 104 nc is

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Unformatted text preview: to answer the next question. Charged Spheres –3.0 Q +3.0 Q –3.0 Q 2.0 m Z 4.0 m X Y The force exerted on sphere X by sphere Y has a magnitude of 6.0 N. A third sphere, Z, with a charge –3.0 Q is introduced, as shown in the diagram. 14. The magnitude of the net force on sphere X, due to spheres Y and Z, is A. B. C. D. 9.0 N 12 N 18 N 24 N 9 Use the following information to answer the next two questions. Magnetic Resonance Imaging Magnetic resonance imaging is used in medicine to produce images of a body’s internal structures and tissues. This imaging technique relies on the interaction of nuclei with an external magnetic field. When a hydrogen atom is placed in a magnetic field, it will absorb electromagnetic radiation (EMR) in the radio frequency range. The frequency absorbed varies as a function of the magnetic field strength. Frequency as a Function of Magnetic Field Strength 70 Frequency (MHz) 60 50 40 30 20 10 0 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Magnetic field strength (T) The slope of the line in the graph above is called the gyromagnetic ratio. 15. The units of the gyromagnetic ratio will be A. T MHz B. T s C. 1 T⋅s D. T.MHz 10 Numerical Response 6. When a hydrogen atom is placed in a magnetic field with a strength of 0.80 T, the EMR wavelength absorbed is __________ m. (Record your two-digit answer in the numerical-response section on the answer sheet.) 16. A proton and an alpha particle have identical circular orbits in a magnetic field. The proton has a speed of 4.4 × 105 m/s. The speed of the alpha particle is A. B. 2.2 × 105 m/s C. 4.4 × 105 m/s D. 17. 1.1 × 105 m/s 8.8 × 105 m/s Extra-high-voltage lines carrying 600 kV are used to transmit electrical energy. A transformer must be used to reduce the voltage to 120 kV for use in a factory. If there are 500 turns on the primary coil, the number of turns on the secondary coil and the type of transformer used are, respectively, A. B. C. D. 100 turns, step up 2 500 turns, step up 100 turns, step down 2 500 turns, step down 11 Numerical...
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