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harimakenji
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Homework Statement
1. Rod A has negative charge and is used to induct rod B. Rod C then charged by touching it with B. The charge on C is…
a. Neutral
b. Positive
c. Negative
d. Undetermined2. a. Plastic comb that we hold can be charged by rubbing. Why a copper can’t be charged when we are holding it?
b. How to charge copper rod by rubbing?3. 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
4. Three identical neutral conductors are in contact with P on the leftmost, Q is middle, and R is rightmost. A negative rod is hold near R. After that, P is pulled to the left, followed by Q. Finally, the rod is taken away. Find the charge on each conductor after separation
Homework Equations
The Attempt at a Solution
1. I think in order to induct rod B, rod B must be earthed (or not?) and it will gain positive charge. Then using conduction, rod C will gain positive charge. True?
2. I do not know why
3. 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?4. P will be negative and R will be positive, but Q? I guess Q will be neutral but not really sure about the reason. Maybe all negative charges are located in P and positive charges in R, leaving Q uncharged. Or Q still has the same amount of electrons and protons? Dunno