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Questions of Chapter 16

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Liu Qiaochu

on 11 March 2014

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Transcript of Questions of Chapter 16

If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged?

Rub a plastic ruler, because ruler will have negatively charge , put it close to comb, if attract, cob is positively charged, if apple, comb is negatively charged.
2.Why does a shirt or blouse taken from a clothes dryer sometimes cling your body?
The shirt or blouse can get charge from dryer, the air inside is dry, that make the charge can be attracted by your body, so the shirt or blouse cling to your body.
4.A positively charged rod is brought close to a natural piece of paper, which it attracts. Draw a diagram showing the separation of charge and explain why attraction occurs.

When the rod move close to the paper, the negatively charge move to the place that can attract the rob which has positively charge. The positively charge on the paper also move, but the force attract already let the mob and paper together, the like charges are now father apart, there’s a net attraction between the rod and the paper.
5.Why does a plastic ruler that has been rubbed with a cloth have the ability to pick up small pieces of paper? Why is this difficult to do on a humid day?

Static electricity. One a humid day static charges would be harder due to the water, moisture, in the atmosphere.
6.Contrast the net charge on a conductor to the “ free charges” in the conductor.

The free charges in conductor usually refers to all of those electrons which are mobile throughout the body of the conductor. The net charge is the sum of charges in the conductor.
8.When an electroscope is charged, its two leaves rpel each other and remain at an angle. What balance the electric force of repulsion so that the leaves don’t separate further?
3.Explain why fog or rain droplets tend to form around ions or electrons in the air.
Because fog or rain was water, water is a polar molecule. It not only has positively charge, but also negatively charge, that make it easily attract other charges.
7.Figures 16-7 and 16-8 show how a charged rod placed near an uncharged metal object can attract (or repel) electrons.

There are a great many electrons in the metal, yet only some of them move as shown. Why not all of them.
Questions of Chapter 16
10.
In figure 16-7, electrons will move until the attractive force on the remaining conduction electrons due to the incoming charged rod is balanced by the repulsive force from electrons that have already gathered at the left end of the neutral rod. In figure 16-8, conduction electrons will be repelled by the incoming rod and will leave the stationary rod through the ground connection until the repulsive force on the remaining conduction electrons due to the incoming charged rod is balanced by the attractive force from the net positive charge on the stationary rod.
The electroscope leaves are connected together at the top. The horizontal component of this tension force balances the electric for of repulsion.
9.The form of Coulomb’s law is very
similar to that for Newton’s law of universal gravitation. What are the difference between these two laws? Compare also gravitational mass and electric charge.
a.Electrostatic force can be attract or apple; gravitational force just can be attract.

b.Charge can be positive or negative, but gravitational mass only has one form.
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