Why does a straight conductor placed along the axis of a long solenoid not experience…

PHYSICS · Subjective · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

Why does a straight conductor placed along the axis of a long solenoid not experience any mechanical force, whereas the same conductor placed perpendicular to the axis inside the solenoid does? Answer in one or two sentences.

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