A Very Long Straight Current-Carrying Wire Produces a Magnetic Field $20 \mathrm { mT }$

question 76

Multiple Choice

A very long straight current-carrying wire produces a magnetic field of $20 \mathrm { mT }$ at a distance $d$ from the wire. To measure a field of $5 \mathrm { mT }$ due to this wire, you would have to go to a distance from the wire of

• A) \(16 d\).
• B) \(2 d\).
• C) \(d \sqrt { 2 }\)
• D) \(8 \mathrm {~d}\).
• E) \(4 d\).

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