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Old Aug 8th 2010, 09:49 AM   #1
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Join Date: Aug 2010
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electrostatic

1. a. When a negatively charged object brought close to negatively charged electroscope, the leaf rises more
b. When a positive object is brought close to a positively charged electroscope, the leaf becomes closer.

Explain the above phenomena

2. Which of the following can attract a stream of water?
(i) a positively charged conductor
(ii) a positively charged insulator
(iii) a neutral conductor

a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1,2, and 3


3. I read there are 3 ways to charge an object. I know induction and conduction. What is the last one? Electromagnetic induction will do but I haven't covered that yet. Is there another method which is simpler?

4. Which of the following figures shows a current of electrons?




my ans:
1. I understand part (a), the electrons repel each other more. But what about (b)? In my opinion, the leaf also rises more because the protons on outside object repel protons on electroscope. Why can the leaf become closer?

2. I am guessing the answer is (d). A positive conductor or isolator can attract the negative charge of water (maybe the negative ion) and neutral conductor can also do it. Not sure though

3. Do not know

4. I guess there is no right answer in the choices. Electrons will flow from more negative to more positive object. (a) and (c) have the same amount of charge so they are neutral compared to each other. for (b) the electrons should flow from left to right because left one is more negative. for (d) electrons should flow from right to left because the left one is more positive.
Right or wrong?

Thank you very much
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