• Notes & Hazards
• Corrections
• Helpful Links

Random helpful notes for your experiment:

1. Notes on the Theory part:
   • Refer to Fig. 2 on p. 113: The wire segment moves in a magnetic field. That movement of the wire causes the diaphragm to move in and out.
   • For the speaker: force transduction depends on the motion of the wire so only changes in force are detected.
   • The resistance (R) is no longer linear with the length (L) and area (A) once a material stretches "too much". Therefore, the calibration curve (of mV vs. kg) is not linear everywhere (see Fig. 4 on p. 114).
2. Notes on the Procedure part:
   • Section 4.1, p. 117, Step 6: For Channel 2 (the speaker acting as a microphone), ty the following settings on the oscilloscope: 2ms/div; 50mV (x10)
   • Section 4.2, p. 117, Step 2: Get at least 10 data points (e.g., 1, 3, 5, 7, 9, 14, 15, 17, & 19)
   • Section 4.2, p. 118, Step 3: please use extreme caution when using the seat; it is extremely easy to fall off or to have the apparatus come off. Also, you can very easily hurt yourself when the seat starts to swing (when you sit on it) so please, be very, very careful around it.
3. Some good links:
   • A really nice link to how the Wheatstone Bridge works. Be sure to check out the Java applet AND the background page.
   • An even better explanation is available here: whatsit.
   • Yet another perspective on the Wheatstone Bridge is here: Zebu.Oregon.Edu.

1. Minor typos throughout.

Required Materials:

1. Laboratory Manual (SGM 407)
2. Laboratory Answer Book
3. Calculator with statistical functions

1. This lab will be quick and easy for everyone. It's very straight-forward and very simple so you should be outta here early for a change!
2. Teacher evaluations this week. MakeUp labs next week. If you need to make-up a lab, please make sure to sign the Lab Make-Up sheet this week. Also, all old quizzes & final announcements will be given in the first 5 minutes of the lab next week (so you might want to come by lab for about 5 minutes next week even if you don't have to make-up a lab).
3. Lab Written Final:

   Location	MHP 106
   Time	Tuesday, April 18, 2000 from 5-6:30pm
   Format	Approximately 7 questions; relatively easy (1 hard question, 2 medium questions, 3 straight-forward questions).

4. Lab Practical Final:

   Location	Regular Lab Room
   Time	Regular Lab Time the week of April 17, 2000
   Format	1/2 the class will be there for the 1st hour and a half; second half will be there for the last hour and a half. 3 questions total (overview/synopsis next week and on the website); 1 mandatory question followed by 1 of remaining 2 questions. Approximately 1/2 hour for each of 2 experiments.

5. Feedback on if you're finding these pages helpful (or not) is definitely good. So if you have any strong opinions, or, dare I say it, ideas on how to make this better, drop me a line! Also, if you have any thoughts on the final review, please feel free to drop me a line as I'll be working on that next week.