Question

with the help of an activity show how magnetic field lines around a bar magnet can be obtained also draw the pattern of magnetic field lines around a bar magnet

Answer 1

take some iron filling. on a paper put magnet then sprinkle iron filling around it you will be able to see the field lines

Answer 2

Activity to draw magnetic lines around the bar magnet:

1. Fix a white paper on the drawing board.
2. Place a magnetic compass on the centre of the drawing board.
3. Mark the North Pole and South Pole pointed by the magnetic compass.
4. Connect the two points with a straight line (magnetic meridian).
5. Place a bar magnet in the magnetic meridian.
6. Place a magnetic compass near the north pole of the bar magnet, mark the North Pole pointed by the compass with a point.
7. Place the compass at another point such that the south pole of the compass should point the point marked in step 5.
8. Repeat the steps 5 and 6 till the magnetic compass reaches South Pole.
9. Connect all the point as a smooth curve.
10. Same procedure is followed in the different point of the bar magnet.

Thus, the magnetic pattern of the bar magnet is obtained.