Rajkumar said to you that the magnetic field lines are open and they start at north pole of bar magnet and end at south pole. What questions do you ask Rajkumar to correct him by saying field lines are closed?

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Solution

To correct Raj kumar and provind field lines to be closed curves, questions cab be:
1) If filed lines start from north pole and end at south pole, what is their alignment inside the magnet?
2) Being open, field lines need not start any particular point.Why is it North pole?
3) Why the field lines around current carrying wire are concentric circle?

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