This means you will need to zero the reading each

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the Slinky around can cause a change in the field, even if no current is flowing. This means you will need to zero the reading each time you move or adjust the Slinky. 3. Click to begin data collection. Close and hold the switch for about 10 seconds during the data collection. As before, leave the switch closed only during actual data collection. 4. View the field vs. time graph and determine where the current was flowing in the wire. Select this region on the graph by dragging over it. Find the average field while the current was on by clicking on the Statistics button, . Count the number of turns of the Slinky and measure its length. If you have any unstretched part of the Slinky at the ends, do not count it for either the turns or the length. Record the length of the Slinky and the average field in the data table. 5. Repeat Steps 13 – 15 after changing the length of the Slinky to 0.5 m, 1.0 m, and 1.5 m. Each time, zero the Magnetic Field Sensor with the current off. Make sure that the current remains at 1.5 A each time you turn it on. Analysis: 1. For each of the measurements of Part II, calculate the number of turns per meter. Enter these values in the data table. 2. Plot a graph of magnetic field B vs. the turns per meter of the solenoid ( n ). 3. How is magnetic field related to the turns/meter of the solenoid? 4. Determine the equation of the best-fit line to your graph. Note the constants and their units Calculating the Permeability of Free Space 1. From Ampere’s law, it can be shown that the magnetic field B inside a long solenoid is B = o nI where o is the permeability constant. Do your results agree with this equation? 2. Assuming the equation in the previous question applies for your solenoid, calculate the value of 0 using your graph of B vs. I . Also calculate 0 using your graph of B vs. n . 3. Look up the value of 0 , the permeability constant. Compare it quantitatively to your experimental value. 4. Was your Slinky positioned along an east-west, north-south, or on some other axis? Will this have any effect on your readings?
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  • Fall '09
  • Physics, Current, Magnetic Field, Magnetic Field Sensor, Vernier Magnetic Field Sensor

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