Magnetic Fields Lab. Station #1 à Determining Magnetic Flux Lines

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1 Magnetic Fields Lab Regents Physics Name Mr. Putnam Station #1 à Determining Magnetic Flux Lines You must FIRST FIND WHICH END of your compass needle that points Geographic North. THIS WILL BE THE NORTH NEEDLE FOR YOUR SPECIFIC COMPASS! Be certain to move it away from all nearby magnetic fields. You must do this BEFOREHAND to assist you in finding magnetic flux lines. 1. Determine the poles of your magnet EACH time you use the magnet. The field directions may not be as they are printed due to storage with other magnets. 2. After each sketch of the magnetic fields, be certain to return your iron filings to the container. Using the bar magnets, place a plastic sheet ON TOP OF the magnet and sift iron filings lightly on top of the plastic. Draw the field produced. 3. Now place two magnets with LIKE poles about 3 cm apart next to each other. Draw the field produced.

2 4. Repeat #3 using two magnets with UNLIKE poles 3 cm apart next to each other. Draw the field produced. 5. Place a bar magnet on the lab table and place a compass in the positions shown in the diagram below. Draw the flux lines, compass directions with arrows and label the poles on the magnet. Station #2 à Current & Magnetic Fields [1 st Left-Hand Rule] 1. For Station #2, place a compass on top of the circular platform of Ampere s Apparatus. Be certain to find the North needle of the compass prior to starting the Lab station. 2. Connect the positive wire to one end of your apparatus and the negative wire to the other end. Turn on the Voltage source FOR AN INSTANT and note the direction of the compass needles. Draw the direction that the compasses point and label the wires on the diagram + and - for the set-up below. Be certain to confirm this with your 1 st left-hand rule! 3. Mr. Putnam MUST approve your diagram before you move on!

3 * Draw the compass directions with arrows on the diagram of your set-up below. Station #3 à Electromagnets [2 nd Left-Hand Rule] 1. Using the electromagnet with the wire and core provided. Connect the ends of the wires from the electromagnet to the power supply with wire clips. 2. Using your 2 nd hand-rule for solenoids and electromagnets, determine the North and South end of your electromagnet. 3. Place a compass near the end of the electromagnet you think is the North Pole and turn on the Voltage source FOR ONLY AN INSTANT. 4. Mr. Putnam MUST approve your diagram before you move on! * Draw on the diagram the wire on the coil and they way it is wrapped. direction of the current in the wire by using arrows compass readings for the set-up.

4 Station #4 à Magnetic Field Strength and Distance 1. At the LabQuest station, you will collect the Magnetic Field Strength at increasing distances from a Test Magnet. 2. Begin with the Magnetic Field Sensor (There are 2 types!). a. Type #1 has a WHITE DOT on the end of the probe. When taking measurements, the White Dot must be facing the magnetic pole of the Test Magnet. (See diagram) b. Type #2 has the magnetic field detector at the end of the probe. When taking measurements, the end of the probe must be facing the magnetic pole of the Test Magnet. (See diagram) 3. With the test magnet at the end of a meter stick, place the probe 1 cm away from the pole of the Test Magnet and enter the Magnetic Field Strength reading in MilliTeslas (mt) in the Data Table in your lab. (See diagram) 4. Move the probe to 3cm from the pole of the Test Magnet and continue collecting according to the Data Table. 5. Continue to collect your data, moving the probe to 5cm, 7cm, 9cm away and so on until you are 29 cm from the Test Magnet. 6. Record your values in the table on the next page. 7. Make a graph on Excel for Magnetic Field Strength vs. Distance [x-axis]. White dot Magnetic Probe (Type #1) Test Magnet Meter stick Magnetic Probe (Type #2) Test Magnet Meter stick

5 Distance [cm] 1cm 3cm 5cm 7cm 9cm 11cm 13cm 15cm 17cm 19cm 21cm 23cm 25cm 27cm 29cm Magnetic Field Strength [mt] Using Excel 1. Make a graph on Excel for Magnetic Field Strength vs. Distance [x-axis]. 2. Be certain to label the axis, graph title, trendline & equation for your graph. Conclusion questions 1. How do you find the magnetic flux line vector for any magnetic field? 2. Draw the magnetic field surrounding the wire at right. I 3. Draw the magnetic field surrounding the wire with current shown at right. (Dot indicates the direction of current) 4. Using your graph for reference, what is the mathematical relationship between Magnetic Field Strength and Distance? 5. What other two other concepts that we have studied in Physics have the same relationship!

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