Question

what is mean by magnetic field lines

Answer 1

the lines which generates when a conductor is carrying a current surrounding it is called magnetic field lines and a specific area of that lines is called magnetic flux

Answer 2

These are the lines created around a magnetic field which shows the direction of the field. These are closed curves or closed concentric circles.
The more close the magnetic field lines are the more stronger the field is. The direction of magnetic field lines outside the bar magnet is from North to South Pole of the magnet. And the direction inside the magnet is from South to North Pole of the magnet.

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