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mikael mikael
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9 years ago
A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance of 
A) 16d 
B) 8d 
C) 4d 
D) 2d 
E) d 
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padrepadre
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9 years ago
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mikael Author
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9 years ago
Thanks for the homework assistance, my physics class is a big challenge.
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