Electricity Flashcards
How many ways of charging do we have in order to charge a neutral object?
3 ways
What is the 1st way of charging a neutral object?
Contact- In this way, we just contact a charged object with a neutral one, and then the same sign of charge is gained by the neutral object.
What is the 2nd way of charging a neutral object?
Rubbing- This method works for Insulators ( a material which has no free electrons, like plastic). Whenever, two insulators are rubbed against each other, the one which has higher tendency in gaining the electron, is negatively charged, and the one which has lost the electrons will be positively charged.
Based on Triboelectric series, the table which includes all insulators in ascending order in gaining the electrons, the materials which is lower after rubbing, will be negatively charged, the one which is above, will be positively charged.
What is the 3rd way of charged a neutral object?
Induction- Induction works for conductors, the point is, there is NO CONTACT between the charged object and the neutral one, it is just close to the neutral object.
What are the 2 scenarios that could happen for Induction.
1st- There is just one sphere that is close to the charged rod. As a result of this, positive and negative charges are separated in the sphere, and then by connecting the sphere to the earth, if there is extra electrons, earth accepts it (gains it). After that, by cutting the connecting wire and the removing the rob we have a charged positively sphere.
2nd- There are two spheres which are into contact and by keeping a rod which is charged close to one of them, the same charge is repelled, so at the other side of the further sphere, this charged is gather, and the opposite charge is attracted, so it is close to the rod. At last, by separating these two spheres, both are charged
