Chapter 19 - Magnetism - Learning Path Questions and Exercises - Conceptual Questions - Page 688: 3

a). The iron filings get farther apart. Thus the magnetic field strength decreases with distance from the middle. b). The magnetic field points up and down. But we cannot tell if it points up or down from looking at the filing pattern alone.

a). The iron filings get farther apart. Thus the magnetic field strength decreases with distance from the middle. b). The magnetic field points up and down. But we cannot tell if it points up or down from looking at the filing pattern alone.