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Magnetism Physics 102 3. With the switch open, place a large compass under a straight part of the wire away from the battery and switch. Then close the switch momentarily and observe what the compass does. The compass is pointing in the direction of the magnet field produced by the current in the wire. Write your observations on the direction of the magnetic field in your lab report. 4. Again with the switch open, place the compass on top of the straight wire. Then close the switch momentarily and observe what the compass does. Write your observations in your lab report. Compass Under Wire Compass Over Wire 5. Mark on your diagram the direction of the magnetic field on top of and under the wire. 6. Reverse the leads on the battery so the current flows in the opposite direction and observed the direction of the magnetic field on the top of and under the wire when closing the switch. Data Analysis/Conclusion 7. Use right-hand rule #1 to determine the direction of the magnetic field for each case and compare with your measurements. Do they match? If not, go back and redo your measurements. Experiment 4 - Magnetic Forces Wanlolsay the right hand rule. 1. Construct the same circuit as in experiment 3 but arrange the wires so one wire hangs off the end of the table as shown in the diagram below. Draw this diagram in your lab report. B * cable -P I loved you 2. Take three bar magnets and hold them together so they all have the same magnetic orientation, All north on one side and all south on the other. Bring the north ends of the three bar magnets near the hanging wire, placing them just below the wire pointing vertically upward, as shown in the diagram. Close the switch and observe what happens. Which way does the wire move? Record the results in your lab report. 3. Reverse the ends of the magnets so that the south poles are just below the wire pointing upward and repeat step 2. Data Analysis/Conclusion 4. Use right-hand rule #3 to verify the direction of the magnetic force on the wire and compare with your measurements. Do they match? If not, go back and redo your measurements. Draw a picture showing the direction of current, magnetic field and force for each case above in your lab report