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

Question

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. 4 d
B. 2 d
C. 8 d
D. 16 d

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