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Chapter 16: Q7Q (page 443)

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?

Short Answer

Expert verified

Only a few of the electrons are free to move; that is why only a few of them are shown in the figures.

Step by step solution

01

Concepts

The same charge repels, and the opposite charge attracts.

Free charge means a loosely bound charge in the conductor.

02

Explanation

There are so many atoms inside a conductor that mean so many electrons are present in the conductor. But all electrons are not free to move. Only a few of them are free electrons, meaning only a few electrons can freely move inside the conductor due to being loosely bound.

That is why only a few of them are shown in the figures.

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Most popular questions from this chapter

The balloon in Fig. 16–48 was rubbed on a student’s hair. Explain why the water drip curves instead of falling vertically.

A negative point charge is in an electric field created by a positive point charge. Which of the following is true?

(a) The field points toward the positive charge, and the force on the negative charge is in the same direction as the field.

(b) The field points toward the positive charge, and the force on the negative charge is in the opposite direction to the field.

(c) The field points away from the positive charge, and the force on the negative charge is in the same direction as the field.

(d) The field points away from the positive charge, and the force on the negative charge is in the opposite direction to the field.

Question:Two point charges,Q1=−6.7μC andQ2=1.8μCare located between two oppositely charged parallel plates, as shown in Fig. 16–65. The two charges are separated by a distance of x=0.47m. Assume that the electric field produced by the charged plates is uniform and equal toE=53,000N/C. Calculate the net electrostatic force onQ1 and give its direction.

FIGURE 16–65 Problem 55.

(II) Compare the electric force holding the electron in orbit(r=0.53×10−10m)around the proton nucleus of the hydrogen atom, with the gravitational force between the same electron and proton. What is the ratio of these two forces?

(II) A charge of 6.15 mC is placed at each corner of a square 0.100 m on a side. Determine the magnitude and direction of the force on each charge.
See all solutions

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