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774_Physics ProblemsTechnical Physics

774_Physics ProblemsTechnical Physics - 114 P27.30 Current...

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114 Current and Resistance P27.30 R R R R T T R T T c n c c n n = + = + + + 1 1 0 0 α α b g b g 0 0 0 = + R T T R T T c c n n α α b g b g so R R c n n c = − α α R R R R R R 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 α α α α α α 1 1 10 0 1 0 400 10 0 500 10 1 1 3 3 1 . . . k C C e j e j R n = 5 56 . k and R c = 4 44 . k P27.31 (a) ρ ρ α = + = × + × ° = × 0 0 8 3 8 1 2 82 10 1 3 90 10 30 0 3 15 10 T T b g e j a f . . . . m m (b) J E = = × = × ρ 0 200 3 15 10 6 35 10 8 6 . . . V m m A m 2 (c) I JA J d = = F H G I K J = × × L N M M M O Q P P P = π π 2 6 4 2 4 6 35 10 1 00 10 4 49 9 . . . A m m mA 2 e j e j (d) n = × × = × 6 02 10 26 98 6 02 10 23 28 . . . electrons g 2.70 10 g m electrons m 6 3 3 e j v J ne d = = × × × = 6 35 10 6 02 10 1 60 10 659 6 28 19 . . . A m electrons m C m s 2 3 e j e je j µ (e) V E = = = A 0 200 2 00 0 400 . . . V m m V b ga f P27.32
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