1) The ground wire is removed first The charged rod is then withdrawn, leaving t
ID: 1274635 • Letter: 1
Question
1) The ground wire is removed first The charged rod is then withdrawn, leaving the sphere with a positive charge. Would the sphere be left with a charge if the rod were removed first, followed by the grounding wire? If so, would the charge be positive or negative?
2) When an object is given a positive charge, by the process of induction for example, (a) does its mass increase, decrease or remains constant? (b) What if the object is given a negative charge by induction? How does the mass change (if it does)? Explain
3) Consider a proton and an electron, each held at a fixed position. The proton is located at x=?x0 while the electron is at position x=+x0. If they are released simultaneously, which particle will arrive at the origin first? Assume that the only force present is the Coulomb force between them.
4)A neutral conductor is supported by a nylon thread. A positively charged glass rod is then brought near but does not make contact. The sphere is attracted toward the rod. If the sphere then makes contact with the rod, it is suddenly repelled away from the rod. Explain.
5) In what ways are gravitational forces similar to electric forces? In what ways are they different?
6) two small conducting spheres are separated by a distance of 25.0 cm. One carries a charge of ?30.0
Explanation / Answer
1) NO, if charged rod is removed first, the induced charge will disappear.
2) When an object is given positive charge, some of it's electrons run away and thus mass of the object decreases. If the object is given negative charge, some electrons are added to the object and thus the mass of the object is increased.
3) Equal force will act on both particles. However, proton has huge mass as compared to the electron and thus will have less acceleration. Electron will have very large acceleration and will move faster and thus reach the origin first.
4) When the charged rod is brought closer, some of the nearby electrons adjust in such a way so as to develop a local negative charge. Thus attraction takes place even if the conductor is neutral as a whole. When the rod is touched, a lot of electrons will jump out of the sphere into the rod. This will lead to positive charges on both thus causing repulsion.
5) Both follow inverse square law relationship with distance. Both are conservative forces. They are different in the sense that gravitational is always attractive whereas electrostatic can be attractive or repulsive.
6) Initial force = -194.4 N. Negative sign shows attraction. Final force will be 8.1 N. Positive sign shows repulsion between both spheres.
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