Magnetic Field of a Long Wire: 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 from the wire of
A. 16d.
B. 8d.
C. 4d.
D. 2d.
E. d
Answer: C
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