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MethodLab Part 1: Magnetic Field of a Long Straight ConductorOpen up page 1 Straight Wire Current on LoggerPro.Connect the power supply and the long straight conductor to each other and set the current to 7A on the power supply. The red (+) and black (-) terminals should be used.Using the little switch on the sensor, set the sensor to a 0.3mT range and bend the head of the sensor. The sensor should look similar to the image below.Start from a distance of 2cm away from the conductor, both measure and record the results in the table next to the graphs.Take measurements along the r direction using intervals of 1cm for a total of 5 points.Analyze the relationship between inverse distance and the magnetic field of a straight conductor by selecting the graph at the bottom, magnetic field vs. Distance graph and use a linear fit. Lab Part 2 Magnetic Field at the Centre of a Single CoilOpen up page 2 Single Coil Current on LoggerPro.Turn the power supply off and use the white plugs to connect a single coil to the power supply.Place a ruler or meter stick using a retort stand so that it passes through the middle of the coil.Make sure the sensor is completely straight and using the little black switch on it, turn the range to 6.4mT. Place the sensor on top of the meter stick so that it is in the centre of the coil. Click the zero button on LoggerPro. Turn the power supply back on and set it to 2A.Press play on LoggerPro and record the standard deviation and mean of the line into the chart right beside the graphs.Reduce the current by 0.4A intervals and repeat step #6 until you reach 2A.Add the uncertainty by double clicking the title then options -> fixed value, and entering a value in the error constant +/- space.After you have filled the chart, the graph below will show the relationship between magnetic field and electric current graph. Select Analyze -> Linear Fit to better understand the relationshipLab Part 3 Magnetic Field Along the Central Axis of a single coilOpen up page 3 Single Coil Distance on LoggerPro.Look at the maximum value of the magnetic field strength found in Lab Part 2 and divide it by 5 to determine the starting point. From this point, take measurements along the central axis in intervals of 3cm until you have covered the same distance on both sides. (If 6 cm were covered on the right of the midpoint, 6cm should be covered from the left too.) Remember to record results using metres. At each 3cm mark, press play on LoggerPro and record the distance, mean and standard deviation in the chart beside the graphs similar to step #6 in Lab Part 2.Similar to Part 2 Step #6, add the uncertainty for the displacement.Analyze the bottom graph to understand the relationship between Magnetic Field in a coil and Distance by clicking Analyze -> Curve Fit-> General Equations -> Single Coil -> Try Fit -> Ok.Lab Part 4 Magnetic Field of a Two CoilsOpen up page 4 Helmholtz Coil Distance on LoggerPro.With the power supply off, add another coil parallel to the first one. Connect both coils to the power supply so that their magnetic fields are in the same direction. Verify this by using the right hand rule.Turn the power supply on and set it to 1A.Repeat step 3&4 from Lab Part 3, this time taking the sensor through both of the coils.Repeat step 5&6 from Lab Part 3, however, select Helmholtz coil rather than Single Coil.

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