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16_Chapter 19 HomeworkCH19 Magnetism

16_Chapter 19 HomeworkCH19 Magnetism - 156 CHAPTER 19 19.35...

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156 CHAPTER 19 19.35 Treat the lightning bolt as a long, straight conductor. Then, the magnetic field is ( )( ) ( ) 7 4 5 0 4 10 T m A 1.00 10 A 2.00 10 T 20.0 T 2 2 100 m I B r π µ µ π π × × = = = × = 19.36 Model the tornado as a long, straight, vertical conductor and imagine grasping it with the right hand so the fingers point northward on the western side of the tornado. (that is, at the observatory’s location) The thumb is directed downward, meaning that the conventional current is downward or negative charge flows upward . The magnitude of the current is found from 0 2 r B I µ π = as ( )( ) 3 8 -7 0 2 9.00 10 m 1.50 10 T 2 675 A 4 10 T m A rB I π π µ π × × = = = × 19.37 From 0 2 B I r µ π = , the required distance is ( ) ( ) ( ) -7 3 0 3 4 10 T m A 20 A 2.4 10 m 2.4 mm 2 2 1.7 10 T I r B π µ π π × = = = × = × 19.38 Assume that the wire on the right is wire 1 and that on the left is wire 2. Also, choose the
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