# ch26_p5 - J = × × × = − 2 10 32 10 10 10 6 4 14 19 5 m...

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5. (a) The magnitude of the current density is given by J = nqv d , where 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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Unformatted text preview: J = × × × = − 2 10 32 10 10 10 6 4 14 19 5 / . . . . m C 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....
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