pta_7262_7133910_47716.doc - Principles of Physics 9...

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( 摘自 Principles of Physics 9 edition) 28-2) A particle of mass 12 g and charge 80 C moves through a uniform magnetic field, in a region where the free-fall acceleration is j ˆ 8 . 9 m/s 2 . The velocity of the particle is a constant i ˆ 20 km/s, which is perpendicular to the magnetic field. What, then, is the magnetic field? 28-9) In Fig. 28-31, an electron accelerated from rest through potential difference V 1 = 1.00 kV enters the gap between two parallel plates having separation d = 20.0 mm and potential difference V 2 = 100 V. The lower plate is at the lower potential. Neglect fringing and assume that the electron’s velocity vector is perpendicular to the electric field vector between the plates. In unit-vector notation, what uniform magnetic field allows the electron to travel in a straight line in the gap? 28-11) An ion source is producing 6 Li ions, which have charge + e and mass 9.99×10 -27 kg. The ions are accelerated by a potential difference of 10 kV and pass horizontally into a region in which there is a uniform vertical magnetic field of magnitude B = 1.2 T. Calculate the strength of the smallest electric field, to be set up over the same region, that will allow the 6
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