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Old Dec 7th 2009, 12:23 PM   #1
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Exclamation 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......??
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Old Dec 14th 2009, 01:47 PM   #2
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Originally Posted by alex83 View Post
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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