Physics 241 Lab – Matt Leone – Week 1 [email protected] (email preferred), PAS 376, o. 520-621-6819 Office Hours: M & W 11:00-11:50, or by appointment. Consultation Room (PAS 372): F 12:00-12:50 Policies for threatening behavior by students: http://policy.web.arizona.edu/~policy/threaten.shtml Also refer to Physics 241 Policies handout and Using TurnItIn.com handout. Students with special needs who are registered with the S.A.L.T. Center (http://www.salt.arizona.edu/ ) or the Disability Resource Center (http://drc.arizona.edu/ ) must submit appropriate documentation to the instructor if they are requesting special accommodations; General Comments: • You need 10 out of 12 lab reports handed in to pass so DON’T turn in nothing! • I don’t want you to write novels. Look to my guidelines carefully to see what I think is most important and what format will be easiest for that week. • Labs are due IN CLASS. You lose points for late work. Nothing is taken past 48 hours late. Any valid excuse requires written documentation immediately given the next time we meet. An example of documentation is a photocopy of a hospital receipt with your private info blacked out. Talking to me in advance of difficulties is always in your best interest. • Labs are full so you must come to the lab you registered for. There is a makeup at the end, but it requires a valid excuse!!! • WARNING: CHEATING is dealt with harshly in this department!! Depending on the intent and severity, students sometimes get zeros on assignments, fail the WHOLE COURSE, and get either temporary or permanent cheating marks written on their transcripts. This can keep you out of med school or prevent you from working for some government agencies. Leave the lab with your own set of data and work by yourself to write your report. Also, don’t copy text from your lab manual. Restate all ideas in your OWN WORDS. • ADVICE: Set up D2L to forward to your gmail account (or other inferior webmail account). Go to preferences > email scroll to forwarding. In fact, all my email gets forwarded to my gmail account, [email protected]: Lab reports are out of 25 points. Reports are broken down into different sections, and each section is worth a certain amount of points. PLEASE LABEL YOUR SECTIONS. You get 4 or 5 points for coming to lab, doing good work, cleaning up your station and not leaving prematurely. The possible sections are • Title. Not worth points so make it fun! • Goals. Describe in 2 or 3 sentences what the BIG IDEA was for the lab. What was the heart of the matter? What basic principles were you studying experimentally? • Theory. This is often the biggest section. Simply put, you need to describe how the physics concepts studied in this lab fit together and describe the mathematics used to model these concepts. You often will need to write one or two derivations here to show where a formula you used comes from. • Procedure. Here you tell what you did in general terms. You do not need to give every detail. For instance, “The charge on sphere A was found to be positive when +1000 Volts was applied to it.” is much better than, “The metallic paddle was brought to touch the surface of sphere A. Next, the metallic paddle was placed inside the Faraday cage, and the electrometer showed that the metallic paddle had a net positive charge.” Just tell me the important steps in the order you did them. If your procedure seems too long, it probably is. • Results. This section is where you report what you found. NOT the raw data, but rather the results of your data. This includes tables, graphs, using formulas, and statistics (and error). All the stuff you are supposed to do WITH your raw data. Don’t interpret your results (unless it explains where another result comes from) because interpretation of what you found goes in the conclusion section. Graphs should be hand-drawn and stapled to the back. • Conclusion. Describe the meaning of your results. Describe how what you found experimentally relates to the BIG IDEA you described in your introduction. • Problems. I will often ask you to answer some specific conceptual problems. Maybe I will have you make a separate question section, or maybe I will tuck the questions in where they logically belong. I don’t know yet so please read my instructions for each lab report each week. You should attempt to answer questions from the lab manual while working. However, only my problems will need to be incorporated into the report. • Attachments. The above text goes to TurnItIn.com for checking. Print out your report and attach your RAW DATA RECORDED IN LAB and your HAND-DRAWN GRAPHS.Week 1 Lab – Electrostatics and the Electric Field This week’s lab is like several little experiments so it makes sense to break up the report into sections that match the little experiments. Ellipsis means you should already know what to write. In this lab, results will mean what you observed as well as any pictures or observations you are asked to make in the manual. This week, I am being very detailed in what I would like to see for your benefit. 1. Title - … 2. Goals - … 3. Theory – Describe in words the physics behind the difference between macroscopic charge flow and local polarization. Describe the different materials that produce these effects. Relate the concept of electric field to the observed effect that like charges repel and opposite charges attract. 4. (I). Magnetic Fields a. Procedure - … b. Results - … c. Problem 1: Imagine that I gave you an unlabeled bar magnet. Describe how you would use a compass to find which end is the north magnetic pole and which end is the south magnetic pole. 5. (II). Electrostatics a. Procedure - … b. Results - … c. Problem 2: Explain in detail what causes the pith ball to be at one time attracted to the glass rod and at another time to be repelled by the glass rod. d. Problem 3: Using the concepts of “insulator” or “conductor”, explain the difference between the peanuts/glass rod attraction and the pith ball / glass rod attraction. e. Problem 4: If the electroscope accumulates excess charge, the charge spreads out uniformly over the scope and the gold foil is repelled by the other part of the electroscope (as in figure 3, page 3). However, the same behavior can be noticed if the
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