magnetic lines behave like a stretched band.why is it so?
Stacey Warren - Expert brainly.com
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kindly elaborate your question.
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).