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which of the following is true about magnetic field lines at the north pole and south pole of a bar magnet?

a. field lines begin near the center of the magnet and extend toward the north and south poles.
b. field lines begin near both the magnet’s north and south poles and meet in the middle.
c. field lines begin near the magnet’s north pole and extend toward its south pole.
d. field lines begin near the magnet’s south pole and extend toward its north pole.