We can prove that the field of an infinite solenoid is zero at infinity using a symmetry argument.

Name: We can prove that the field of an infinite solenoid is zero at infinity using a symmetry argument.
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The magnetic field of an infinite solenoid is uniform inside and zero outside due to the symmetry of the system. Far from the solenoid, the contributions from individual current loops cancel out, leading to a net magnetic field of zero at infinity.

We Can Prove That the Field of an Infinite Solenoid