Need help with part C number 8. A little confused. Part C results are given.

Part B No core Galvanometer deflection and secondary current direction Switch open 1 in positive direction Switch closed 3 in negative direction iron core Galvanometer deflection and secondary current direction Switch open 50 in positive direction Switch closed 50 in negative direction Part C Length of coil still inside Amount of negative deflection Amount of positive deflection 1 1.5 2 2 3.5 4 3 6 8 4 12 14 5 18 24 6 29 31 7 36 4o 8 42 50 N S Figure 2: The image shows the cylindrical magnet with a dot on one end that is used in the experiment. To understand the polarity of the magnet, the cylindrical magnet is shown next to a bar magnet with clearly labeled poles and again with a compass. Part C: Dependence on length of coil 6. The length of the primary coil is measured; see Figure 3. The switch is open and the primary coil, with the iron core insert, is placed inside the secondary coil. The switch is briefly closed, the deflection of the galvanometer is observed and the length of the coil inside of the secondary coil is noted. In this case you are to observe the amount of the deflection to the positive and the amount of the deflection to the negative. 7. Move about Icm of the primary coil out of the secondary coil and again note the magnitude of the deflection to either side. Repeat until the coil is Icompletely removed. 8. For each length, find the average magnitude of the deflection and plot a graph of this magnitude as a function of the length of the primary coil inside the secondary coil. IN CHINA LL OL 6 8 12 13 Figure 3: A picture of the primary coil and a centimeter ruler (the numbers shown are centimeter markings). This image is to be used to determine the length of the primary coil