Physics Help Forum magnitude of magnetic field

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 Dec 7th 2009, 01:23 PM #1 Junior Member   Join Date: Dec 2009 Posts: 8 magnitude of magnetic field A current I is uniformly distributed over the cross section of a long, straight wire of radius a = 2 mm. At the surface of the wire, the magnitude of the magnetic field is B = 8 mT. The magnitude of the magnetic field 5 mm from the axis is......??
Dec 14th 2009, 02:47 PM   #2
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 Originally Posted by alex83 A current I is uniformly distributed over the cross section of a long, straight wire of radius a = 2 mm. At the surface of the wire, the magnitude of the magnetic field is B = 8 mT. The magnitude of the magnetic field 5 mm from the axis is......??
Use Ampere's law to reach the expression of the magnetic field at any point outside the wire and you're done.
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