ch32-p069 - 69. (a) We use the result of part (a) in Sample...

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Bt rV d e Vr d e e e tt t t bg ch di b gb gb g b g c h = F H G I K J F H G I K J =− ×⋅ × × × −− µε τ ττ 00 0 000 71 2 3 12 13 12 22 4 10 885 10 100 080 16 212 10 50 12 10 2 π TmA V mm sm m T C Nm ms 2 .. . The magnitude is () 13 12ms 1 .2 10 T . t e (b) At time t = 3 , B ( t ) = –(1.2 × 10 –13 T) e –3 / = –5.9 × 10 –15 T, with a magnitude | B ( t )|= 5.9 × 10 –15 T. 69. (a) We use the result of part (a) in Sample Problem 32-1:
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