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Answer:
a) the bar magnet comes to rest in north-south direct parallel to the north and south pole of the earth
b) S is marked on the side of magnet where the magnetic field meats the magnet. the magnetic field starts from north makes a semicircular path and ends on south
c) if north pole of another magnet is brought near the north pole of this magnet, they will repel each other.
d) if south pole is brought near north pole they will attract each other
e) the freely hanging bar magnets has its own magnetic field but the bar magnetvitself is under the influence of earth's magnetic field so the magnet in order to attain a stable position, aligns itself in direction of earths magnetic field that is, north-south direction
f) DC motor, generator, solenoid, transformers use directional property of magnet.