ch30-p038 - 38. From the kink in the graph of Fig. 30-61,...

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38. From the “kink” in the graph of Fig. 30-61, we conclude that the radius of the circular region is 2.0 cm. For values of r less than that, we have (from the absolute value of Eq. 30-20) 2 () (2 ) B d dBA dB Er A r a dt dt dt
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