ch26-p007 - n is the number of particles per unit volume, q...

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J × × = 21 0 3 21 0 1 01 0 6 4 14 19 5 /. . . . mC m / s A / m 2 c hc hc h (b) Since the particles are positively charged the current density is in the same direction as their motion, to the north. (c) The current cannot be calculated unless the cross-sectional area of the beam is known. Then i = JA can be used. 7. (a) The magnitude of the current density is given by J =
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Unformatted text preview: n is the number of particles per unit volume, q is the charge on each particle, and v d is the drift speed of the particles. The particle concentration is n = 2.0 10 8 /cm 3 = 2.0 10 14 m 3 , the charge is q = 2 e = 2(1.60 10 19 C) = 3.20 10 19 C, and the drift speed is 1.0 10 5 m/s. Thus,...
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