Magnetism

Question 1

What do magnets consist of?

Answer 1

Magnets consist of two poles: a north and south pole. The south side of a compass is attracted to the north pole, and the north side of a compass is attracted to the south pole.

Question 2

Explain magnetic field lines

Answer 2

• Arrows are attracted to the south pole
• They move south to north inside the magnet and north to south outside the magnet

Question 3

Compare ferromagnets and permanent magnets

Answer 3

Ferromagnets: (of a body or substance) having a high susceptibility to magnetization

Permanent Magnets: a magnet that retains its magnetic properties in the absence of an inducing field or current

Question 4

Explain the domain theory

Answer 4

Ferromagentic substances are substances that become magnetic in the prescence of a permanent magent. The domain theory states that all ferromagnetic substances have domains that face random directions. When put next to a strong magnetic field, all the domains line up, resulting in the substances becoming magentic

Question 5

What is demagnitization?

Answer 5

1. ‘soft’ ferromagnetic material will revert back to random dipole structure in the absence of a magnetic field.
2. ‘hard’ ferromagnetic material will retain its dipole structure in the absence of a magnetic field.

Question 6

What does it mean when an object can perform reverse magnetism?

Answer 6

• Dipole arrangement can be reversed under a strong magnetic influence.

Question 7

What does it mean when a magentic substance is magnetically saturated?

Answer 7

• All dipoles are oriented in the same direction.

Question 8

What did Orested discover?

Answer 8

That electric currents create magentic fields too!

Question 9

Explain conductors and their right-hand rule

Answer 9

When electric current runs through a conductor, a magnetic field is created at right angles ot the direction of the current.

Holding a straight conductor in your right hand will allow the thumb pointing in the direction of the current will allow curled fingers to show the direction of magnetic field lines.

Question 10

Explain coils and their right-hand rule

Answer 10

A coil is a straight conductor bent into a loop, intensifying strength. The more current and/or loops, the greater the magnetic field

Question 11

Explain boards and their right-hand rule

Answer 11

Current can run into boards (X) or out of boards (O). Point your thumb in the direction of the current. Your curled fingers tell you the direction of the magentic field.