20 magnetism

Question 1

Definition

Laws of Magnetism

Answer 1

1. Like poles repel each other.
2. Unlike poles attract each other.

Question 2

Properties

Magnetic Field Lines

Answer 2

• Lines exits the North Pole and enters the South Pole
• Lines do not intersect each other
• Lines that are closer together represent a stronger magnetic field strength

Question 3

Magnetic Materials

Answer 3

• Steel
• Iron
• Nickel
• Cobalt

Question 4

Non-Magnetic Materials

Answer 4

• Aluminium
• Brass
• Copper
• Glass

Question 5

Methods

Magnetisation

Answer 5

• Stroking
  
  • Single
  • Double
• Use of Direct Current

Question 6

Methods

Demagnetisation

Answer 6

• Heating
• Hammering
• Use of Alternating Current

Question 7

Uses

Magnets

Answer 7

• Electromagnets
  
  • Scrap Material Sorting
  • Credit, Debit and ATM Cards
  • Television, Computer Monitors
  • Electric Bell
  • Circuit Breakers
  • MRI Scanners
  • Magnetic Relay Systems