Conceptual Physics

Chapter Assumptions

Unless stated otherwise, the reference configuration for zero electric potential and zero electric potential energy is one in which there

is infinite separation between charges.

Answers to selected problems

Chapter 24 Answers

C.1(a) It doubles

(b) Yes

(c) No

C.4(a) No

(b) Answers vary

(c) No

Answers vary

0.1 (a) Always positive

(b) Closer to

0.3 (a) It increases

(b) A vertical line

1.1 (a) 5.4 μJ

(b) í5.4 μJ

(c) Closer together

1.3 (a) í52.3 J

(b) 52.3 J

(c) Farther apart

2.1 (a) 5.09eí3 J

(b) í5.09eí3 J

(c) 5.09eí3 J

2.3 (a) 2.75eí2 J

(b) í2.75eí2 J

(c) 2.75eí2 J

2.5 (a) 6.71eí4 J

(b) í6.71eí4 J

(c) 6.71eí4 J

(d) Yes

3.12.6 J

3.3(a) 2e2 N

(b) 2eí13 J

3.53.0eí12 m

4.1(a) 1.44eí9 V

(b) í1.44eí9 V

(c) Near the proton

(d) Magnitudes are equal

4.32.41eí9 C

6.1 32 V

7.1(a) 6.34eí20 J

(b) í6.34eí20 J

(c) 0.396 V

7.2(a) 1.28eí20 J

(b) 8.83e25 ions

7.4(a) 1.04e4 J

(b) $ 2.6eí 4

7.5í2.66eí2 C

10.12.53e+8 V

10.3(a) Sphere

(b) The surface closer to the point charge

(c) 0.32

11.1í9.6eí14 J

11.3-40.9 V

11.5710 V

11.7(a) Planes parallel to the yz plane

(b) x = 2.24 m

(c) x = 1.87 m

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