analogy

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    Thibo Van Doninck
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    Give the magnet and the charged ball to the child then put that child, with permission of the parents of course, on the carousel. The three contributions to the hyperfine field can then be illustrated as follows. First is the dipoler contribution, the child is holding a bar magnet which means that the magnetic field at the center of the carousel will be nonzero. Next is the orbital contribution, a current is formed by the child holding the charged ball. A moving charge creates a magnetic field and so contributes to the magnetic field at the center of the carousel. Now imagine that the child is able to move the charged ball in the center of the carousel and take that the center of the carousel is charged itself. This causes an overlap of two currents which again gives rise to a magnetic field.

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