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Ampere's circuital law is a fundamental principle in electromagnetism that relates the magnetic field around a closed loop to the electric current passing through that loop. It states that the line integral of the magnetic field around a closed loop is equal to the product of the electric current passing through the loop and the permeability of free space.
The monopole thought experiment is a hypothetical scenario that involves a single magnetic charge, or monopole, instead of the usual dipole configuration of north and south poles. It is used to explore the implications of Ampere's circuital law in the absence of magnetic charges.
The monopole thought experiment helps to illustrate the symmetry of Ampere's circuital law and the fact that it applies equally to electric and magnetic fields. It also highlights the fact that while electric charges can exist as isolated monopoles, magnetic charges have never been observed in nature.
In the monopole thought experiment, the magnetic field around a closed loop is still related to the electric current passing through that loop, as stated by Ampere's circuital law. However, in the absence of magnetic charges, the field is entirely due to the motion of electric charges, and there is no separate contribution from magnetic charges.
The monopole thought experiment is a useful tool for understanding the implications of Ampere's circuital law, but it is purely hypothetical and does not reflect the reality of our universe. Magnetic charges have never been observed, and the existence of monopoles would require a significant revision of our understanding of electromagnetism.