magnetic lines behave like a stretched band.why is it so?

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magnetic lines behave like a stretched band.why is it so?

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Because there are no magnetic monopoles. That is, there is no such thing as a magnetic "charge," the way there are electrical charges, which can serve as a source or sink of magnetic field lines. WIthout a place for the field lines to start or stop, all field lines must be closed loops at all times. They act like stretchy bands because a larger loop means a stronger magnetic field at the source (which is some electrical current). So increasing the size of a loop takes work (extra current), and shrinking the loop releases energy (as the magnetic field energy converts back to electric current).

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