Date Lab Performed: Section s1

Name: Dr. Julie J. Nazareth Lab Partner(s): Physics 133L Date lab performed: Section: Current Balance

Parts I: Force versus current

Table 1: Length of current Current Loop: loop, L ( ): Current, Mass, Net Mass, Net Force, I (Amp) m (g) mI=0 – m (g) Fnet (N)

0.0 mI=0 = 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7

Part II: Force versus length

Table 2:

Mass of magnetic assembly without current, mI=0 (g): Length, Mass, Net Mass, Net Force, Current Loop L ( ) m (g) mI=0 – m (g) Fnet (N) SF 40 SF 37 SF 39 SF 38 SF 41 SF 42

Graphs: Plot the following graphs on separate sheets of graph paper. If graphs are completed (and required slopes calculated) before leaving class, each lab group only needs to complete one set of graphs (instructor must sign off). Use most of the paper to draw your graph – spread out your data! Draw a best-fit straight line to your data points and calculate the slope. Put the required slope calculations on the graph paper in an unused corner. Draw a small box around the points (not data points) you used to calculate the slope. Don’t forget to title and label your plot.

 Part I: Force versus Current (Fnet vs. I)

 Part II: Force versus Length (Fnet vs. L)

Lab: Current Balance Updated 11/02/12 Data & Reporting score: Lab: Current Balance Updated 11/02/12 Calculations: Show the following calculations in the space provided below or on an attached sheet of paper. Don’t forget units! Part I:  Net force for I = 1.5 Amp

 Magnetic field strength, B1, from the slope of the graph of Fnet vs. I

Part II  Net force for current loop SF 41

 Magnetic field strength, B2, from the slope of the graph of Fnet vs. L

Analysis

 Percent difference between B1 and B2

(B1 - B2) Percent difference = ҙ 100% = average(B1,B2 )

There are no assigned questions to answer for this lab.

Don’t forget to write your summary! (As always, make sure you start your paragraph with an introductory sentence stating the purpose/goal of experiment. How does the force on a current carrying wire in a magnetic field depend on the amount of current in the wire …and depend on the length of wire? You estimated the strength of the magnetic field using two different sets of data (part A and part B). Be sure to discuss how B1 and B2 compare to each other. Do they agree within a reasonable experimental uncertainty? Make sure you define what you consider to be a “reasonable experimental uncertainty”. If they do not agree within a “reasonable uncertainty”, what things beyond your control might have affected your experiment?)

Lab: Current Balance Updated 11/02/12