3. Charging a human being: Through questions 1 and 2, you may have wondered: \"h

Question

3. Charging a human being: Through questions 1 and 2, you may have wondered: "how do l charge up an object if it starts off as being neutral?" In the start of your lab, you will transfer charge from a neutral paper to a charging rod via the friction of rubbing the paper towel on the rod. This will either transfer electrons from the paper towel to the rod (if the rod is labeled "minus"), or transfer electrons from the rod to the paper towel (if the rod is labeled "plus"). At the end of your lab, you will charge up objects using a Van de Graaff generator, shown in Figure 2 (left). This generator uses a series of friction events to transfer electrons from the electrical outlet, through a conveyor belt, and onto the surface of the large metal dome on the top of the generator. Electrons on this surface are not stable in the presence of excess charge, and they readily move through any material available to return back to ground. You will read more about how to

Explanation / Answer

a) strofoam is insulator so it does not conduct electricity. now by touching the dome, charge get tranferred from dome to person but it does not go to ground as styrofoam is insulator. so ultimately charge goes to surface i.e. on skin . now hairs also have some charge due to which hairs repel each other because they are charged with same charge. thats why hairs stand.  

b) now foot being on gorund, so all extra charge from dome gets transferred to ground so we do not feel those effects.   

c) first case will produce more shock because as we jump to ground, charge will instantly flow to ground with almost zero resistance but in second case, resistance of other body will make the discharging slow so lesser shock

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