Which is the incorrect statement about the magnetic field lines? a. Magnetic field lines form a ...

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Which is the incorrect statement about the magnetic field lines?
a. Magnetic field lines form a closed loop.
b. Magnetic field line do not interest each other.
c. Tangent to the magnetic field line curve at any point gives the direction of magnetic field at that point.
d. Outside the magnet, magnetic field lines run from South to North pole of the magnet.
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