676_Physics ProblemsTechnical Physics

676_Physics ProblemsTechnical Physics - 16 Electric Fields...

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16 Electric Fields Section 23.7 Motion of Charged Particles in a Uniform Electric Field P23.42 Fq Em a == a qE m = vv a t fi =+ v qEt m f = electron: v e = ×× × −− 1 602 10 520 48 0 10 911 10 439 10 19 9 31 6 .. . . ej af ms in a direction opposite to the field proton: v p = × 1 602 10 520 48 0 10 167 10 239 10 19 9 27 3 . . in the same direction as the field P23.43 (a) a qE m × × 1 602 10 640 614 10 19 27 10 . . . 2 (b) a t 1 20 10 6 14 10 61 0 ×= × t t 195 10 5 . s (c) xx v v t if −= + 1 2 di x f × = 1 2 1 20 10 1 95 10 11 7 65 . e j m (d) Km v ==× × = × 1 2 1 2 1 67 10 1 20 10 1 20 10 22 7 6 2 15 . kg m s J P23.44 (a) a qE m × 1602 10 600 10 576 10 19 5 27 13 . . e j m s so ai =− × 13 . ± 2 (b) a 2 02 5 7 6 1 0 0 0 7 0 0 21 3 =+− × v i bg vi i 284 10 6 . ± (c) a t 0 2 84 10
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