The following experiment was to demonstrate the electrical charge by rubbing two materials together and by interacting charged objects with water and oil. The concept of the experiment is to analyse the electrostatic concept of each material.
The following experiment was to demonstrate the electrical charge by rubbing two materials together and by interacting charged objects with water and oil. The concept of the experiment is to analyse the electrostatic concept of each material.
Table 1. Charging of objects
|
Object |
Rubbing Material |
Observation |
|
Steel Spoon |
Wool |
No attraction |
|
Silk |
No attraction |
|
|
Cotton |
No attraction |
|
|
Balloon |
Wool |
Weak attraction |
|
Silk |
No attraction |
|
|
Cotton |
Weak attraction |
|
|
Plastic Comb |
Wool |
Weak attraction |
|
Silk |
Strong Attraction |
|
|
Cotton |
Strong attraction |
Table 1 shows the objects and rubbing materials used to make an observation whether it caused attraction or repulsion. The objects used were steel spoon, balloon, and plastic comb. Each object used three similar rubbing materials which are wool, silk, and cotton cloth. As seen in Table 1 above, the steel spoon had no attraction in all rubbing materials used. The balloon had a weak attraction only to wool and cotton cloth. On the other hand, plastic comb had a strong attraction with silk and cotton cloth and a weak attraction with wool cloth. These observations applied the fundamental concept of electrostatic attraction wherein conductors like metals only allow electric charges to pass through while insulators like balloon and plastic comb produce a static charge. It causes electrostatic attraction since the cloth gives electrons to the insulators which causes the objects to be negatively charged and attracts positively charged objects.
Experiment 2 used a charged object to interact with water and oil. Application of the observed attractions found in Table 1 was used as an object to interact with water and oil. Since plastic comb had a stronger interaction with the rubbing materials compared to the balloon, we used the plastic comb in this experiment.
Water consists of hydrogen and oxygen atoms which are made up of positive charges from the hydrogen atoms, hence, the interaction between the water and the plastic comb causes the water to bend due to repulsion. Oil, on the other hand, has neutral charges. In simpler words, they do not have a negative or a positive charge, therefore, they do not have an attraction or repulsion with the plastic comb.
Question:
1. What are the three ways of charging a neutral body with static electricity? Identify which method was used in this experiment.
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