Fusion/Plasma/Magnetism Videos. Video 1: PSFC Fusion Research at MIT: Alcator C-Mod and the Plasma Science and Fusion Center (by MIT)

Transcription

1 Fusion/Plasma/Magnetism Videos Watch the two videos and take note on this page. Create two quiz questions and go to the wiki and add your question to the page I created on the homework page. Use the Edit link on the page to edit the page with your questions (put your name next to your questions). Press the save button at the bottom to save the changes you made (be sure to put your name in as the author before you hit the save button). Video 1: PFC Fusion Research at MIT: Alcator C-Mod and the Plasma cience and Fusion Center (by MIT) Video 2: Fusion: ature s Fundamental Energy ource (by General Atomics)

2 Fun with Magnets Lab Purpose: To familiarize yourself with the properties of magnets Materials: Five kits for this experiment are on top of the demo podium at the front of the room. Work with one partner for this experiment. One kit contains the following items: One canister iron filings One horseshoe magnet Two bar magnets One cylindrical magnet, broken in half (making two magnets, in theory) Two colored ring-shaped magnets One compass One piece of acrylic plastic (Plexiglas) You also have these shared resources on the front counter contains the following items: Procedure: Two different boxes with approximately 200 paperclips in each box (don t mix up the paperclips as there are different sizes in each box) An empty plastic bin for you to carefully recycle the iron filings used in the lab 1. Measure magnet strength. We don t have a Gaussmeter, but we do have paperclips. If other groups are using the boxes of paperclips, then move onto the next part and come back to this part later. Read the steps below, and then create a properly labeled table to record your data and observations. (a) Put each magnet into one of the boxes of paperclips and see how many paperclips it can pull out. (b) For the bar magnets, repeat the process for each pole of the magnet. (c) For the pair of bar magnets and the pair of ring magnets, stack them end to end (-) and measure their stack strength (attracting magnets). Then repeat measurement after stacking with (-) configuration (repelling magnets).

3 Data Table for Part 1: 2. A compass is a lightweight free-moving magnet balancing on a pin. Use your knowledge of local geography and magnets to determine which arrow (red or silver) is pointing towards the Earth s magnetic north pole. Then determine which arrow on on the compass is which pole of the compass s magnet. Describe your thought process below and draw a sketch of your compass (circle below) with the colors and poles labeled as it is positioned in our classroom (rectangle below). Methodology: Dark Room mart Board Room 104

4 3. ow use your compass to determine the location of the north and south poles for each magnet. After you ve determined the location of the poles, sketch in the magnetic filed lines that we use to illustrate the concept of magnetic fields. Keep in mind that although your diagram is two dimensional, the field line exist in three dimensional space! ote that the poles you find with your magnet may not match the marking on the magnet (these are cheap magnets!!). ome of you have cylindrical magnets that I broke in half. Figure out how they fit together, and see what happened to the poles after I broke the magnet in half. Label the poles on each magnet! Bar Magnet Ring magnet Cylindrical Magnets Horseshoe Magnet Observations for part 3: 4. Mapping field lines using iron filings. Use the method I showed you in class to map/sketch field lines for the magnet configurations given below. prinkle a light, even coat over your Plexiglas (magnets not present). Then place the Plexiglas on top of the arranged magnets, and tap the plastic with a pencil to allow the iron filing to orient themselves in the magnets field. Recycle used iron filing in bin at front of room. First map/sketch the lines for individual magnets above. Label the poles of the magnets. Bar Magnet Ring magnet Cylindrical Magnets Horseshoe Magnet Observations for part 4:

5 5. More interesting configurations for iron filing tests for a, b, c use cylindrical or bar magnets (stronger = better results?) Write a brief conclusion near each sketch. Can you predict the pattern beforehand? Do stronger magnets have different patterns than weak (shape same)? a) 2cm separation b) 2 cm separation c) 6cm separation d) Orient 3 magnets (cylindrical/bar) at 120 degree angles separated by 6 cm in middle. ketch 2 patterns. e. On the back of this page, come up with an interesting pattern of your own and write your observations/conclusions.