Physics unit 5

Question 1

Ferromagnetic elements

Answer 1

Iron, nickel, and Cobalt

Atoms have multiple unpaired “4d” orbital electrons

Question 2

Magnetic vs Non-Magnetic

Answer 2

Magnetic: Domains aligned

Non-magnetic: Domains randomized

Question 3

Properties of magnetic fields

Answer 3

• Always form closed circular loops -> only dipoles, no monopoles
• Start at north pole and end at south pole
• Field lines NEVER cross
• Fields can exert torque on magnetic matter, but cannot exert work on it

Question 4

Basic facts : Electricity produces magnetism

Answer 4

• DC produces circular B fields around them. B weakens with distance
• Greater the current, greater the field strength
• Solenoids and toroids = current carrying loops w/ B
• Strength of magnetic field inside solenoid increase w/# of wires
• Electromagnetism = relativistic effect