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Which statement about magnetic field lines is correct?

Question
Which statement about magnetic field lines is correct?
They can cross at many points
They form closed curves
They exist only outside magnets
They have no direction
Answer
They form closed curves
Detailed Explanation
Magnetic field lines form closed curves, with direction outside from north to south and inside from south to north. — Examisthan.com
A compass needle is best described as a Science · Magnetic Effects of Electric Current The end of a compass needle that points approximately towards north is called the Science · Magnetic Effects of Electric Current Like poles of two magnets Science · Magnetic Effects of Electric Current Unlike poles of two magnets Science · Magnetic Effects of Electric Current

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