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773_Physics ProblemsTechnical Physics

# 773_Physics ProblemsTechnical Physics - Chapter 27 P27.26...

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Chapter 27 113 P27.26 (a) n is unaffected (b) J I A I = so it doubles . (c) J nev d = so v d doubles . (d) τ σ = m nq 2 is unchanged as long as σ does not change due to a temperature change in the conductor. P27.27 From Equation 27.17, τ ρ τ = = × × × × = × = = × × = × = m nq v e 2 31 19 2 8 14 5 14 8 9 11 10 1 60 10 1 70 10 2 47 10 8 60 10 2 47 10 2 12 10 21 2 . . . . . . . . 8.49 10 s m s s m nm 28 e je j e j e je j A Section 27.4 Resistance and Temperature P27.28 At the low temperature T C we write R V I R T T C C C = = + 0 0 1 α b g where T 0 20 0 = ° . C . At the high temperature T h , R V I V R T T h h h = = = + 1 1 0 0 A α b g . Then V V I C a f a f a f e j a f e j a
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