Be Honest

Topics: Electric charge, Electron, Electricity Pages: 7 (1927 words) Published: July 14, 2013
Experiment
6
Experiment
6

Some Properties of Charge

Introduction: Electrical phenomena were studied extensively during the eighteenth century by scientists and amateurs alike including Benjamin Franklin. Among Franklin’s achievements were contributions to the understanding of electrical behavior beyond his famous (and dangerous) work with lightning. During this time, there was a certain social prestige attached to anyone who undertook such studies, and much of what passed for research was really no more than parlor magic designed to impress. The cumulative result of this activity though led to a large amount of empirical information from which Coulomb was able to formulate his electrical force law in 1789. This laboratory exercise is designed to give you some of this empirical experience with electric charge. You may want to read through the relevant chapter in your before beginning. Part 1: Charging An Object

Procedure:
1. Blow up a long, cylindrical balloon and place it against a smooth, vertical surface and let go. What happens? It falls off from the vertical surface.
It falls off from the vertical surface.

2. Now rub the balloon vigorously across some part of your dress and place it against the vertical surface. You can also rub it against your hair. What happens now when you let go? The balloon sticks to the vertical surface while it rolls over and falls off. The balloon sticks to the vertical surface while it rolls over and falls off.

Results:
When I rubbed the balloon against my hair it took away the electrons from my hair and became a negatively charged object and when I put the balloon against the flat surface the electrons in the wall or flat surface repelled away from the balloon and further into the wall. In addition, the protons attracted to the balloon so they came to the surface of the wall because opposite attract the electrons in the balloon holds to the protons on the front of the wall. When I rubbed the balloon against my hair it took away the electrons from my hair and became a negatively charged object and when I put the balloon against the flat surface the electrons in the wall or flat surface repelled away from the balloon and further into the wall. In addition, the protons attracted to the balloon so they came to the surface of the wall because opposite attract the electrons in the balloon holds to the protons on the front of the wall. You have probably seen this behavior before, but now you can attempt to explain it below in detail.

Procedure:
1. Using the plastic adhesive tape dispenser, quickly pull out approximately 30 cm of tape and tear it off. Be careful that it doesn't become tangled. Repeat this keeping the two strips far apart (1 m) and with one piece of tape in each hand hanging vertically, slowly bring them together. What happens? The two strips repelled.

The two strips repelled.

2. With the help of your partner, pass each strip of tape lightly between your fingers one at a time. You have now discharged them. Carefully place one of the strips on top of the other so that the sticky side of the top strip adheres to the plastic (or dry) side of the bottom piece for the entire 30 cm. Leave about 2 cm of the ends apart. Now quickly pull them apart and allow them to hang vertically as you did above and slowly bring them together. What happens now? After discharging them, this time they attracted each other. After discharging them, this time they attracted each other.

3. After discharging and putting the sticky sides together nothing happens. After discharging and putting the sticky sides together nothing happens. After discharging the strips as before, bring the two sticky sides together and repeat #2 and note what happens below:

4. Finally, while you hold the two strips, have your partner obtain two identical strips, and each of you repeat #2. Now you have four charged strips. Bring these...
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