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Q.

Magnetic field lines are closed continuous loops which start at:


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a

The north pole of magnet and end at south pole

b

The south pole of magnet and end at north pole

c

Both a and b

d

None of these 

answer is A.

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Detailed Solution

 Concept: Magnetic field lines are essentially continuous lines that have no beginning or finish. They migrate in the opposite direction, from the north pole to the south pole. They vary from electric field lines in that the former begin on positive charges and conclude on negative charges.
In a bar magnet there are two poles i.e. North Pole and South Pole. The magnetic field lines formed in these poles form closed lines.
magnet-16-v2.7bf2e6b.jpg Hence, option 1 is correct.
 
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