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Magnetism and Matter — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMagnetism and Matter1 Mark
Question
"Magnetic field lines form closed curves." Why?
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Answer

Since there is no existence of isolated pole, that is, poles always exist in pairs. Magnetic lines of force emerge from the north pole and move inside the south pole, hence they make closed curves.

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