782_Physics ProblemsTechnical Physics

782_Physics ProblemsTechnical Physics - 122 Current and...

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122 Current and Resistance P27.61 (a) Ei i =− = dV dx ± . . . ± 04 0 0 0500 0 800 af V m ±Vm (b) R A == ×⋅ × = ρ π A 400 10 0500 100 10 0637 8 4 2 .. . . m m m ej (c) I V R = 400 628 . . V 0.637 A (d) Ji i i × = I A ± . . . ±± 200 10 200 4 2 8 A m Am MAm 22 (e) i E × = = 4 00 10 2 00 10 8 00 88 ± . ± A m V m 2 e j P27.62 (a) i = dV x dx V L a f (b) R A L d ρρ A 4 2 (c) I V R Vd L 2 4 (d) i I A V L (e) E V L ± P27.63 RR TT =+ 00 1 α bg so R R T I I L N M O Q P L N M O Q P 0 0 0 0 1 1 1 1 αα . In this case, I I = 0 10 ,s o + ° 0 1 92 0 9 000450 2020 .C C . P27.64 R V III = 12 0 6 00 300
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