- Purpose To Investigate The Phenomenon Of Static Electricity Objectives Phy 112 Activity 1 Static Electricity To Gene 1 (23.81 KiB) Viewed 42 times
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During this course, we will investigate the force of electromagnetism and its importance to modern society. A good starting point is to make some basic observations of the effects of static electricity. 1. First, the teacher will charge the balloon and bring it near a pile made of small scraps of paper. (a) How do the scraps react- do they move away from the balloon or move toward the balloon? (b) Is the reaction stronger or weaker as the balloon gets closer to the scraps? (c) What happens when a charged balloon is brought near another object (someone's hair, a wall etc.)? (d) What happens when a charged balloon is brought near an uncharged balloon?
(f) The instructor does this with a second piece of string, also hanging from the rod. Then the instructor brings the two pieces of string close to each other. How do the strings react to each other? 2. The instructor next sets up a computer simulation (sim) showing a balloon, a sweater, and a wall. (a) With no charges shown, the instructor rubs the balloon on the sweater. The balloon is then moved away from the sweater slightly and released from rest. What happens? (b) The balloon is then brought close to the wall and released from rest. What happens? The instructor then sets the sim to show electric charges on the sweater and the wall (note that positive charges are represented as red plus signs & negative charges as blue minus signs). No charges are shown on the balloon. (c) IT'he instructor rubs the balloon again on the sweater. What happens to the balloon?
2. The instructor next sets up a computer simulation (sim) showing a balloon, a sweater, and a wall. (a) With no charges shown, the instructor rubs the balloon on the sweater. The balloon is then moved away from the sweater slightly and released from rest. What happens? (b) The balloon is then brought close to the wall and released from rest. What happens? The instructor then sets the sim to show electric charges on the sweater and the wall (note that positive charges are represented as red plus signs & negative charges as blue minus signs). No charges are shown on the balloon. (c) The instructor rubs the balloon again on the sweater. What happens to the balloon? (d) The instructor releases the balloon from rest near the sweater. Why Hoes the balloon act the way it acts (as seen in part (a) above)?
(e) The instructor brings the balloon near the wall. What happens to the charges on the wall? The instructor next resets the sim to show just the differences in charges on each object and then rubs the balloon on the sweater. (f) What sign charge appears on the balloon? What sign charge appears on the sweater? Are they the same or opposite? The instructor resets the sim and adds a second balloon (so now we have one yellow and one blue balloon). Both balloons are rubbed on the sweater. (g) What sign(s) charge appears on each balloon? (h) What happens when the balloons are placed near each other (and separated from the sweater)?
(0) Lastly, what happens to the amount of charge on a balloon as we continue to rub it on the sweater? 3. The following questions concern experiences in everyday life. (a) You walk along a carpeted floor and reach for a metal doorknob. You receive a small shock. Briefly describe why this happened. (The instructor may show another sim to illustrate the physics)
4. Using the above, derive some rules for static electricity. (a) How might one go about creating a static electrical charge? Cite an example from the above demonstrations. (b) How many "kinds" of static electricity are you aware of? What are they called? (c) How do different kinds ("charges") of electricity react to each other? Think in terms of force.
(d) Which shows a stronger reaction-static electricity on a smooth surface, or static electricity on a sharp surface? (e) How does the strength of the reaction to static electricity depend on distance? (f) How is it that objects with no initial static electricity (like hair, scraps of paper, strings etc.) react to an object (like a balloon) with static electricity? (g) What is implied by the term "static"? (h) We can say that an electrically charged object emits an electric "field". Briefly cite some evidence from these demonstrations for this claim