A Long Wire Is Known to Have a Radius Greater

question 31

Multiple Choice

A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?

• A) 4.6 mm
• B) 7.1 mm
• C) 5.3 mm
• D) 12 mm
• E) 10 mm

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