Q.

Magnetic lines of force

       

          

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a

always intersect 

b

are closed curves

c

are open curves

d

do not pass through vacuum

answer is B.

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Detailed Solution

 Magnetic lines are starts at the North end of a bar magnet and moves towards the south end of the bar magnet (out side of a magnet), and inside of the magnet they will move from south end to North end of the magnet.

  So, they are closed curves

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Magnetic lines of force