Conceptual Physics

Chapter Assumptions

Elementary charge, e = 1.60×10–19 C

Mass of electron, me = 9.11×10–31 kg

Mass of proton, mp = 1.67×10–27 kg

Unless stated otherwise, use 5.00×10–5 T for the strength of the Earth's magnetic field at its surface.

Answers to selected problems

Chapter 28 Answers

C.1 Down

Answers vary

C.2 (a) The field is perpendicular to the plane of the wires.

(b) Reinforce

(c) Cancel

Answers vary

C.5 (a) No

(b) Electron

C.6 No

Answers vary

C.9 No

Answers vary

C.12(a) Toward you

(b) Left

(c) Down

(d) Down

C.14(a) Negative

(b) Positive

(c) Answers vary

C.16Away from you

Up

0.1 (a) Curve

(b) No

(c) Yes

7.1 (a) 6.08eí16 N

(b) Positive y direction

7.3 (a) 805 m/s

(b) East

7.5 1.78 C

7.7 17.3°

9.1 (a) 2

(b) 180q

(c) 90.0°

10.10.417 T

10.30.631 T

10.55.76eí3 T

11.12.90 T

12.13.00e+4 m/s

12.32.21eí22 J

12.5(a) 1.0e4 m/s

(b) 1.8eí2 m/s

13.12.75eí3 m

13.356.3 m/s

13.53.67e+2 s

13.72.28eí12 T

15.1(a) 1.29eí2 T

(b) Decrease

15.3(a) 4.65eí3 m

(b) 5.65eí3 m

(c) 2.00eí3 m

15.50.0286 m

16.1(a) 8.29 m/s

(b) 1.07 m

(c) 0.872 m/s

(d) 0.708 m

17.1(a) A circle

(b) A straight line

18.114.1 N

18.32.27 A

18.535.2°

20.1(a)

(d)

22.1 2.00eí5 T

22.3 1.14eí3 T

22.5 896 A

22.7 (a) 1.64eí26 N

(b) 55.4 m

22.9 4.58eí23 N, in the same direction as the current

22.11(a) Opposite directions

(b) 75.0 A

22.138.80eí3 m

22.146.67 m

22.15Direction: +z

Strength: 3.66eí7 T

(^748) Copyright 2000-2007 Kinetic Books Co. Chapter 28 Answers