A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this cross-section. The magnetic field is
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The formula to calculate the magnetic field inside the conducting wire is given by
...
The formula to calculate the magnetic field outside the conducting wire is given by
. . .
From equation , it can be concluded that the magnetic field is directly proportional to the radial distance inside the wire, whereas from equation , it can be concluded that the magnetic field is inversely proportional to the radial distance outside the wire.
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