The magnetic field along the axis of a long current-carrying wire is:

Question

Accepted Answer

C. zero on the wire's axis

Symmetry: on the axis of an ideal current line, the field is along the axis only for special geometries
for a straight wire there is no axial field at points on the wire's own line.

Answer

constant

Answer

proportional to 1/r

Answer

proportional to 1/r²

The magnetic field along the axis of a long current-carrying wire is:

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