Copyright © 2003 Nelson Chapter 8 Magnetic Fields and Electromagnetism 237

Instructional Master

Natural Magnetism

LSM 8.1-3

N

S S

N

Figure 2(a) The magnetic field of a single bar magnet is revealed by a number of compasses. (b) The field in one plane is represented by a series of directed lines that by convention

emerge from the N-pole and curve toward the S-pole. (c) Iron filings show the field clearly but do not reveal the pole orientation.

(a) (b) (c)

NN

N

S

magneticfield

N

S

E˚04E˚53

E˚03

E˚52

E˚02

E˚51

E˚01

E˚5

0˚ W˚5

W˚01 W˚5

1

25˚W

30˚W

35˚W

40˚W

50˚W

60˚W

70˚W80˚W

W˚02

E˚0 7E˚ 0 6

E˚0 5

North magnetic poleNorth magnetic pole

Figure 4(a) The magnetic field of Earth closely resembles the field of a large bar magnet. (b) Lines of magnetic declination in Canada

(a) (b)