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Q.

In case of a bar magnet, lines of magnetic induction

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a

emerge in circular paths from the middle of the bar

b

start from the north pole and end at the southpole

c

run continuously through the bar and outside

d

are produced only at the north pole like rays of light from a bulb

answer is B.

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Detailed Solution

out side the bar magnet magnetic field line gives the motion of free unit north pole and inside the magnet it gives the direction of the magnetic field.

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