# What are the signs of static electricity you re observing? (Sparks? Crackles? Interactions?)

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1 Tutorial Name Working from a model: Static electricity You probably associate electrostatics with physics class, but you probably also have lots of experience with static electricity at home. Of course, it s the same stuff! I. What interacts? Obtain a variety of materials from your TA and from your own possessions, including Styrofoam picnic plates, cloth, wax paper, plastic wrap, tin foil, rods of different materials, your clothes, stuff in your pockets, and so on. A. Do any of these materials show signs of static electricity without you doing anything special to them? B. What about when you rub various things together? Are there things you can cause to show signs of static electricity by rubbing them with certain other things? Try some combinations and record the ones that work. What are the signs of static electricity you re observing? (Sparks? Crackles? Interactions?) C. Take a piece of paper and tear it up into little bits (maybe 5mm on a side). Take something that you identified as showing signs of static electricity and bring it close to the little pieces of paper. Does your object interact with the little bits of paper when it s not touching them? Things that attract little bits of paper are said to be electrically charged. The attraction is one kind of electrical interaction. D. Use the bits of paper to test whether the following objects are electrically charged: 1. Your finger 2. A pen or pencil 3. The little bits of paper you made for part C 4. A pith ball 5. A bar magnet 6. A battery E. Get a piece of tape (4-6 inches long) and fold over a little bit of one end. Stick the tape to a smooth plastic binder or table surface and then pull it off. Is it charged? How can you tell? University of Maryland Physics Education Research Group, Spring

3 D. Think about some of the ways you found to uncharge your charged objects. What do you think is going on there? Explain your ideas to a TA before you proceed. III. Types of charge We ll continue investigating how things get charged by making some new charged objects. i. Charge a piece of tape like you did in part I (stick a piece 4-6 inches long onto a smooth surface and pull it off don t forget the folded handle ). Hang it up somewhere where it will not be disturbed. This will be your test tape. ii. Stick another piece of tape (also with a handle) to the same smooth surface. Write the letter B (for bottom ) on the tape. iii. Stick another piece of tape (again with a handle) directly on top of the first tape. Write the letter T (for top ) on that tape. iv. Pull the tapes off the desk together, so that they are still stuck to one another all along their length. Uncharge the pair of tapes using whatever method you have found most effective and appropriate for tapes. v. Hold the folded handles of the two tapes in your opposite hands and pull the two tapes apart. A. Which tape is charged: the T tape, the B tape, neither, or both? Give evidence. What s your explanation for how that happened? B. What kind of interaction, if any, do the T and B tapes have with each other? What kind of interaction does each have with the test tape? C. You probably already know the rule that like charges repel and opposite charges attract. But you could figure that out even if someone didn t tell you. 1. Show that the test tape is either a T tape or a B tape, not by using the rule, but by showing that it interacts with other objects the same way that a T or a B tape does. Make more T and B tapes if you need to. University of Maryland Physics Education Research Group, Spring

4 2. Take uncharged objects and observe how they interact with T and B tapes (attract, repel, both, or neither?). Do uncharged objects have the same interactions as T tapes or B tapes? Or do they have their own special pattern of interactions? 3. See what happens if you take a T and B tape and stick them back together. What is the charge on the resulting object? Explain how that supports calling the charge on T and B positive and negative. Do you have any evidence to tell you which is positive (T or B)? 4. Suppose we have two objects, labeled 1 and 2. Object 1 attracts object 2. From this observation alone, what can you say about the charge on object 1? on object 2? What additional experiments could you do to determine how objects 1 and 2 are charged? D. Now think back to your ideas about how things get charged. 1. Explain what s happening when T and B tapes get charged. 2. Explain what s happening when a test tape gets charged. 3. Explain why Styrofoam plates don t get charged just by rubbing on one another. 4. Explain why your clothes sometimes get charged in the dryer. University of Maryland Physics Education Research Group, Spring

5 5. Explain what s happening when you uncharge an object. Where does the charge go? Explain your ideas to a TA before you proceed. IV. Representing charge In our model of electricity, everything is loaded with positive and negative charges (protons and electrons), but in nearly identical numbers. If you wanted to represent all the charges around in a drawing, you could draw lots of pairs of + and symbols everywhere, but that would get tedious. So it s customary to draw + and symbols only to show that there s more of one or the other. (You could draw a couple of pairs to remind yourself what s going on, though.) Also according to our model, the amount of charge can be distributed in different ways in an object: Different parts of an object may be charged differently. So we use + and symbols to show where on the object there s an excess of which kind of charge. A. A bottom (B) piece of tape and a top (T) piece of tape are separated halfway. Use + and symbols on the diagram to indicate the parts of the tapes that are charged and the type of the charge. B. Suppose you were to take one of the foam plates and rub it with a piece of cloth. Draw a diagram in the space to the right showing the charge on the plate and on the cloth. (Can you tell whether the plate is + or? If not, just pick one!) C. If you earn \$500 and \$150 is deducted in taxes, the amount of money that you take home (\$350) is called your net income. The word net is used similarly to describe the relative amounts of charge on an object. (We also sometimes use the word total. ) If there is more positive charge than negative charge then the object is said to have a net positive charge. If an object has the same amount of both types of charge, then it is common to say that the object has a net zero charge. (We also sometimes say it has no charge, but that could be misleading!) 1. In part A, was the sign of the net charge on the pair of tapes taken together positive, negative, or zero? Explain how you know. 2. In part B, would the net charge on the plate and cloth taken together be positive, negative, or zero? Explain how you know. 3. Check that the drawings you made in parts A and B are consistent with your answers above. University of Maryland Physics Education Research Group, Spring

7 C. Charge the electrophorus again, and, holding it by the cup, touch it to the pith ball and hold it near. 1. Make a prediction for what would happen if you were now to touch the pith ball with a foilcovered straw, still holding the plate near by. Draw a diagram of the charges, to explain your prediction. 2. Try it! If something different happened, same deal: Try to figure out why not. 3. Would the same thing happen if you used a plastic straw, with no foil covering it? How about if you touched it with your finger? Explain. D. D. Try to explain those instructions for charging the electrophorus. Draw a series of sketches showing what happens at each step, in terms of + and charges. Check your thinking with each other and with your TA. University of Maryland Physics Education Research Group, Spring

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Magnificent Magnet Activities Terrie Schmoldt terrieschmoldt@gmail.com 608-921-4787 Magnet Journal It s a great compilation of student work which is useful for: o Portfolios o Student led conferences o