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Answer 1

1.                    The charged glass rod can attract tiny pieces of paper and the charged silk cloth can also attract tiny pieces of paper. ... The point pen refill acquires a positive charge whereas polythene gets the negative charge. All the objects made of clear plastic called acrylic plastic get positive charge on rubbing.
2. The positively charged fibers are now attracted to the negatively charged balloon. When you bring the balloon near a little piece of paper, the negative balloon repels the electrons in the paper so part of the paper near the balloon is positive. ... The negatively charged balloon attracts the paper.
3. Within the papers strips, the electrons get either repelled or attracted according to whether the comb has a negative or a positive charge. ... So it has no effect on the tiny pieces of paper. When the comb is rubbed on a dry cloth, it gets electrically charged.
4. No , paper pieces do not attract to a steel spoon. It will not attract a piece of paper because metallic objects can conduct through them and get dischsrge easily.
5. Rubbing the glass with the silk charges the glass positive, and the glass rod thus charged attracts the paper bits in the same way that the plastic rod does. As noted above, this phenomenon is called triboelectricity, and it depends on the varying affinities that different materials have for electrons.
6. The bits of paper are electrically neutral, but when you bring the rod close to them, even though paper is not a conductor, that is, the charges within it are not free to move about as a current, the negative charges have enough mobility that they are repelled by the rod.
7. Why does a metal scale not attract BITS of paper when rubbed with hair? with plastic scale it is possible, because rubbing it with your hair generates static electricity - as plastic is a bad conductor of electricity. where as metal scale absorbs electrons and hence it doesn't generate that effect.

                about charged or not

1. A charged refill repelled a charged refill. But a charged balloon attracted a charged refill.
2. Because they have the same charge, your hair will stand on end. ... When you rub a balloon against your clothes and it sticks to the wall, you are adding a surplus of electrons (negative charges) to the surface of the balloon. The wall is now more positively charged than the balloon.
3. not charge
4. The Steel spoon cannot be charged easily by rubbing. because it is a metal.so that is why Charges do not build on the surface of the metals. because they pass easily through them as metals are conductors.so here we can say that is why the Steel spoon will not be charged during the rubbing.
5. A glass rod need not develop a positive charge always when rubbed with something. When a glass rod is rubbed with silk, electrons are transferred from the glass rod to the silk. Since the glass rod losses electrons, it becomes rich in positive charge. Similarly, the silk cloth becomes negatively charged.
6. A plastic ruler rubbed with hair will acquire a net negative electrical charge. A piece of paper is made of molecules, and each molecule is electrically neutral, but that doesn't mean that it lacks electrical charges. Molecules have positively charged nuclei and negatively charged electron clouds.
7. Now touch the body to be tested with the metal disc of the charged electroscope. If the divergence of the leaves increases, the body has similar charge that is the given body is also negatively charged. If the divergence of the leaves decreases, the body has unlike charge that is the given body is positively charged.

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Answer 2

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