Multiple Choice
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 
Correct Answer:
Verified
Correct Answer:
Verified
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