Magnetism Properties Part 2

How do magnetic field lines represent the direction of the magnetic field?

• Magnetic field lines represent the direction of the magnetic field by showing the path a small negative charge would take if placed in the field.

• Magnetic field lines represent the direction of the magnetic field by showing the path a small north magnetic pole would take if placed in the field.

• Magnetic field lines represent the direction of the magnetic field by showing the path a small positive charge would take if placed in the field.

• Magnetic field lines represent the direction of the magnetic field by showing the path a small south magnetic pole would take if placed in the field.

What is the shape of the magnetic field lines around a bar magnet?

• Closed loops

• Straight lines

• Dotted lines

• Spirals

True or False: Magnetic field lines never intersect.

• True

• False

• Only in certain conditions

• Sometimes

What is an electromagnet?

• An electromagnet is a type of magnet that is only found in outer space.

• An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

• An electromagnet is a type of magnet that is powered by solar energy.

• An electromagnet is a type of magnet that is created by heating a metal.

How can you increase the strength of an electromagnet?

• Increase the number of turns in the coil, decrease the current flowing through the coil, or use a weaker magnetic core material.

• Increase the number of turns in the coil, increase the current flowing through the coil, or use a stronger magnetic core material.

• Decrease the number of turns in the coil, decrease the current flowing through the coil, or use a weaker magnetic core material.

• Increase the number of turns in the coil, decrease the current flowing through the coil, or use a weaker magnetic core material.

What are some practical applications of electromagnets?

• Refrigerators, to keep food cold

• Electric motors, generators, MRI machines, speakers, magnetic levitation trains, magnetic separators

• Washing machines, to clean clothes

• Televisions, to display images

What are magnetic materials?

• Substances that can be magnetized and attract or repel other magnetic materials.

• Substances that can be magnetized but do not attract or repel other magnetic materials.

• Materials that cannot be magnetized and do not interact with magnetic fields.

• Substances that can only attract other magnetic materials.

Give an example of a magnetic material.

• iron

• glass

• plastic

• wood

What is magnetic induction?

• The process by which a magnetic field is produced in a material when it is placed in a magnetic field or when there is a change in the magnetic field around the material.

• The process by which a magnetic field is produced in a material when it is placed in a gravitational field.

• The process by which a magnetic field is produced in a material when it is heated.

• The process by which a magnetic field is produced in a material when it is exposed to sunlight.

How does magnetic induction occur?

• Magnetic induction occurs when a conductor is exposed to a static magnetic field.

• Magnetic induction occurs when a conductor is exposed to a gravitational field.

• Magnetic induction occurs when a conductor is exposed to a thermal field.

• A changing magnetic field induces an electric current in a conductor.