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Physics
Classical Physics
Electromagnetism
Ampere's law for a larger diameter?
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[QUOTE="jtbell, post: 5459767, member: 20524"] (I'm assuming R is the radius of the wire) If the current density J is distributed with cylindrical symmetry around the axis of the wire, then you can use the total current I to calculate the magnetic field outside the wire. That is, you can pretend that the total current is "collapsed" into a line along the central axis of the wire. This is analogous to the situation where you want to find the electric field outside a charge distribution: if the charge density ρ has spherical symmetry, you can pretend that the total charge is "collapsed" into a point at the center. [/QUOTE]
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Forums
Physics
Classical Physics
Electromagnetism
Ampere's law for a larger diameter?
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