# physics lab

PROCEDURE A – Constructing Magnetic Field Lines of a Bar Magnet
⦁ Tape a sheet of paper on your lab table. Make sure to keep all magnetic materials far away. The arrow on the compass is magnetic and will experience a torque so that the North pole of the compass will point in the direction of the Earth’s magnetic field if no other magnetic fields are present.
⦁ Place the bar magnet in the middle of the paper and trace the outline of the magnet on the paper.
⦁ Determine which ends of your magnet are north or south magnetic poles.
⦁ Then remove the magnet so that you can indicate on the paper the S and N pole locations of the magnet, and replace the magnet in the same position.
⦁ Use a small compass to trace a magnetic field line for the bar magnet. The procedure for line tracing is described in steps 6-9 and indicated in the figure below.

⦁ Place the compass close to the north-seeking pole of the bar magnet (not directly on the centerline). Make two dots on the paper, one on either side of the compass and aligned with the compass needle.
⦁ Move the compass so that the south-seeking pole of the needle is directly over the second dot. Make a new dot exactly in front of the north-seeking pole of the needle.
⦁ Repeat step 7, moving the compass so that the south-seeking pole is over the most recently drawn dot, then making a new dot just beyond the north-seeking pole. Stop when you get back to the bar magnet or when you hit the edge of the paper.
⦁ Draw a smooth curve through the dots. Use several arrowheads along the curve to show the direction of the magnetic field. You have now completed one magnetic field line outside of the bar magnet; inside of the bar magnet, the field line continues to form a complete loop.
Repeat steps 6-9 until you have completed enough field lines to form a reasonable map of the magnetic field of the bar magnet. Five to six lines on each side of the magnet is a good choice; two of the four lines should stay relatively near to the side of the magnet and two should venture relatively far from the side of the magnet.

PROCEDURE B- Constructing Magnetic Field Lines between Unlike poles of two bar magnets.
⦁ Tape a new sheet of paper on your lab table.
⦁ In the middle of the paper, place the unlike poles of two bar magnets facing each other at a distance not so close to get attracted.
⦁ Follow steps 6 to 9 of procedure A to map the field lines between the unlike poles of two bar magnets.
PROCEDURE C- Constructing Magnetic Field Lines between like poles of two bar magnets.
⦁ Tape a new sheet of paper on your lab table.
⦁ In the middle of the paper, place the like poles of two bar magnets facing each other at a distance not so close to getting repelled away.
⦁ Follow steps 6 to 9 of procedure A to map the field lines between the like poles of two bar magnets.
CONCLUSIONS

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