Orient the small coil so that the largest magnetic

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Orient the small coil so that the largest magnetic flux passes through it. Attach the voltage probe to the small coil to read the potential difference across it using the 171
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TIME-VARYING MAGNETIC FIELDS – 1202Lab6Prob6 VoltageTimeLAB application. Or, if you are applying a frequency near 60hz, you might try using a DMM, setting it to read AC voltage. Slowly change the orientation of the small coil to get the maximum and minimum potential difference. Adjust the amplitude of the signal generator to give the maximum reading possible. Now set the function generator to 1Hz and compare the AC voltage reading to the DC voltage reading while using a DMM to measure the potential difference across the small coil. Slowly increase the frequency and observe the results for both AC and DC settings. Decide on the best frequency to use for your chosen method of measuring the induced potential differences in the small induction coil. Connect the Hall probe as explained in the appendices. Decide where you will place the Hall probe to measure the magnetic field. Go through the Hall probe calibration procedure outlined in the appendix, or in the Magnetlab Guide Box in the upper right corner of the application. Be sure the sensor amplification switch on the Hall probe is set to 6.4mT range. The MagnetLab application requires the probe to be set to the 6.4mT range to work correctly. Does the Hall probe ever read a zero field? Use a Hall probe and MagnetLAB to investigate how the magnetic field between the Helmholtz coils varies as a function of time at the frequency you have selected. Make sure to try a number of different frequencies and orientations of the Hall probe between the coils. How does this relate to your earlier measurements using the compass? Adjust the amplitude of the function generator to give a magnetic field reading with the Hall probe. How does the magnetic field reading compare to the frequency of the function generator? What happens to the amplitude of the magnetic field as you change the frequency of the function generator? Select a range of angles to use in your measurement and note the range of magnetic field amplitudes you expect for the function generator frequency and amplitude you have chosen to use. M EASUREMENT For a fixed function generator output, measure how the potential difference across the pick-up coil varies with time as a function of its angle with the magnetic field. Take enough data to convince others of your findings. 172
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TIME-VARYING MAGNETIC FIELDS – 1202Lab6Prob6 A NALYSIS Using your measurements, graph the potential difference across the pick-up coil as a function of time, for a fixed function generator output. What is the period of the potential difference? The frequency? How does this behavior change as the angle between the pick-up coil and the magnetic field changes?
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