774_Physics ProblemsTechnical Physics

774_Physics - 114 P27.30 Current and Resistance b g b R = R c Rn = R c 1 c T T0 Rn 1 n T T0 b g b g 0 = Rc c T T0 Rn n T T0 so R c = Rn R = Rn n Rn

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114 Current and Resistance P27.30 RR R R TT R cn c c n n =+= + + + 11 00 αα bg 0 =− +− RT TRT T cc nn so RR cn n c α R R n n c n n n c c c n n + F H G I K J F H G I K J ×° −×° L N M M O Q P P −− 10 0 1 0400 10 0500 10 3 3 1 . . . k C C ej R n = 556 . k and R c = 444 k P27.31 (a) ρρ = + = ×⋅ + × ° = −− − 83 8 1 2 82 10 1 3 90 10 30 0 3 15 10 af .. . . m m ΩΩ (b) J E == ρ 0200 315 10 635 10 8 6 . . . Vm m Am 2 (c) IJ AJ d F H G I K J × L N M M M O Q P P P = π 2 6 4 2 4 100 10 4 49 9 . . . m mA 2 (d) n = × × 602 10 26 98 23 28 . . . electrons g 2.70 10 g m electrons m 63 3 v J ne d × ×× = 6 02 10 1 60 10 659 6 28 19 . electrons m C ms 2 3 e j µ (e) VE = A 200 0400 . m V P27.32 For aluminum, E ° 390 10 31 C (Table 27.1) ° 24 0 10 61 . C (Table 19.1) R A AT R T T EE ++ +
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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