PASCO SF-8607_08 Basic Current Balance - Manual (Page 10)

scientific 6
012-04046C Current Balance and Accessory
Experiment 2: Force versus Length of Wire
Lab Stand
Main Unit
0.01 gram
Balance
Magnet
Assembly
Current Loop
Procedure
➀
Set up the apparatus as in Figure 2.1.
➁ Determine the length of the conductive foil on the
Current Loop. Record this value under “Length”
in Table 2.1.
If you are using a quadruple-beam balance:
➂ With no current flowing, determine the mass of
the Magnet Assembly. Record this value on the
line at the top of Table 2.1.
Set the current to 2.0 amps. Determine the new
“mass” of the Magnet Assembly. Record this
value under “Mass” in Table 2.1.
➄
Subtract the mass that you measured with no current flowing from the mass that you measured
with the current flowing. Record this difference as the “Force.”
Turn the current off. Remove the Current Loop and replace it with another. Repeat steps 2-5.
If you are using an electronic balance:
➂ Place the magnet assembly on the pan of the balance. With no current flowing, press the
TARE button, bringing the reading to 0.00 grams.
Now turn the current on, and adjust it to 2.0 amps. Record the mass value in the “Force”
column of Table 2.1.
➄ Turn the current off, remove the Current Loop, and replace it with another. Repeat steps 2-4.
Data Processing
Plot a graph of Force (vertical axis) versus Length (horizontal axis).
Analysis
What is the nature of the relationship between these two variables? What does this tell us
about how changes in the length of a current-carrying wire will affect the force that it feels
when it is in a magnetic field?
Length “Mass” “Force”
(mm) (gram) (gram)
Length “Mass” “Force”
(mm) (gram) (gram)
Table 2.1 Data
“Mass” with I=0: ___________
Figure 2.1 Equipment Setup
➃
➃
➅