5.2 Conductors, Insulators, and Charging by Induction

Why electrons move freely in metals but stay bound in glass, polarization of neutral objects, and charging a body without ever touching it.

University Physics Volume 2, 5.2 Conductors, Insulators, and Charging by Induction

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9 exercises

5.2 Exercise 2

When a glass rod is rubbed with silk, it becomes positive and the silk becomes negative—yet both attract dust. Does the dust have a third type of charge that is attracted to both positive and negative? Explain.

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5.2 Exercise 6

Compare charging by conduction to charging by induction.

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5.2 Exercise 8

Trucks that carry gasoline often have chains dangling from their undercarriages and brushing the ground. Why?

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5.2 Exercise 10

Why do some clothes cling together after being removed from the clothes dryer? Does this happen if they’re still damp?

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5.2 Exercise 12

Suppose someone tells you that rubbing quartz with cotton cloth produces a third kind of charge on the quartz. Describe what you might do to test this claim.

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5.2 Exercise 14

Suppose you place a charge q near a large metal plate. (a) If q is attracted to the plate, is the plate necessarily charged? (b) If q is repelled by the plate, is the plate necessarily charged?

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5.2 Exercise 15

Suppose a speck of dust in an electrostatic precipitator has $1.0000 \times 10^{12}$ protons in it and has a net charge of −5.00 nC (a very large charge for a small speck). How many electrons does it have?

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5.2 Exercise 17

A 50.0-g ball of copper has a net charge of $2.00 \mu \text{C}$ . What fraction of the copper’s electrons has been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

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5.2 Exercise 19

How many coulombs of positive charge are there in 4.00 kg of plutonium, given its atomic mass is 244 and that each plutonium atom has 94 protons?

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