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For Examiner’s Use 12 5 A charged particle passes through a region of uniform magnetic field of flux density 0.74 T, as shown in Fig. 6.1. region of uniform magnetic field path of charged particle Fig. 6.1 The radius r of the path of the particle in the magnetic field is 23 cm. (a) The particle is positively charged. State the direction of the magnetic field. [1] (b) (i) Show that the specific charge of the particle (the ratio is given by the expression q of its charge to its mass) m q v , = m rB where v is the speed of the particle and B is the flux density of the field. [2] (ii) The speed v of the particle is 8.2 × 106 m s-1. Calculate the specific charge of the particle. specific charge = © UCLES 2005 9702/04/SPECIMEN PAPER C kg-1 [2] 13 (c) (i) The particle in (b) has charge 1.6 × 10-19 C. Using your answer to (b)(ii), determine the mass of the particle in terms of the unified mass constant u. mass = u For Examiner’s Use [2] (ii) The particle is the nucleus of an atom. Suggest the composition of this nucleus. [1] © UCLES 2005 9702/04/SPECIMEN PAPER [Turn over