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Lab: Current Balance 03/05/ Name: Dr. Julie J. Nazareth Lab Partner(s): Physics 1220L/1520L Date lab performed: Section:
Current Balance
Part A: Force versus current Table 1: Current Loop Name: Length of current loop, L ( ): Current, I (Amp) Mass, m (g) Absolute Value Net Mass, |m I=0 – m| ( ) Absolute Value Net Force, |F net| (N) 0.0 m I=0 = -------------------- ---------------------
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Calculation: Show the calculation of the absolute value net force for a current of 1.5 A. Include units and show work (as always!). | F net| = Part B: Force versus length Table 2: Current used (A): Mass of magnetic assembly w/o current, m I=0 (g): Name of Current Loop Length, L ( ) Mass, m (g) Absolute Value Net Mass, |m I=0 – m| ( ) Absolute Value Net Force, |F net| (N) SF 40 SF 37 SF 39 SF 38 SF 41 SF 42 Calculation: Show the calculation of the absolute value net force for current loop SF 41. Include units and show work (as always!). | F net| =
Lab: Current Balance Updated 03/05/ Graphs: Plot the following two graphs using “Line Fit”. If completed during class, have instructor sign off on graphs. If completed at home, then the graphs must be printed out (and titled and labeled appropriately) and included with the lab report.
Table 3: Raw Results of the Graphs Graph Unrounded slope with uncertainty Slope units Part A: Force vs. Current ± Part B: Force vs. Length ± Calculations: Show the following calculations including uncertainty. Don’t forget units! See Do’s and Don’ts of Physics Lab Reports #26 (DD #26) or ask the instructor if you need help with the final rounding of values with uncertainty. Magnetic field strength, B 1 , from the slope of the graph of Force vs. Current (Part A) Magnetic field strength, B 2 , from the slope of the graph of Force vs. Length (Part B) Question 1. (a) Did the mass registered on the mass balance increase or decrease as you increased the current? Increase decrease (b) The force on the magnet due to gravity points straight down. There is another force on the magnet because of the interaction between the current carrying wire and the magnetic field produced by the magnet. Which direction does this force point? Up Down Left Right (c) What is the direction of the Lorenz force on the current carrying wire in the magnetic field? (I do not mean the direction of the gravity force on the current carrying wire.) Up Down Left Right Question 2: Figure 5 shows the wire that lies between the white and red painted poles of the magnet. You only measure the horizontal section of the wire loop. There are other sections of wire in the loops (see Figure 2) that can be ignored because they lie outside the poles of the magnet so the B-field is negligible. Explain why you don’t have to worry about the vertical sections of current loop that lie between the poles of the magnet.
