Magnetism Basics

What is a magnetic field?

• A magnetic field is a type of weather phenomenon

• A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

• A magnetic field is a type of musical instrument

• A magnetic field is a type of plant species

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Explain the concept of electromagnetism.

• Electromagnetism is the study of static electricity only.

• Electromagnetism has no relation to magnetic fields.

• Electromagnetism is a concept that only applies in outer space.

• Electromagnetism is the branch of physics that deals with the interaction between electrically charged particles and magnetic fields.

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How does magnetic force affect charged particles?

• Charged particles experience a force in the opposite direction of the magnetic field lines.

• Charged particles experience a force parallel to their motion and the magnetic field lines.

• Charged particles experience no force when in a magnetic field.

• Charged particles experience a force perpendicular to their motion and the magnetic field lines.

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Name a few common magnetic materials.

• iron, nickel, cobalt, alloys

• copper

• silver

• gold

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Describe the process of magnetic induction.

• Magnetic induction is the process where a changing magnetic field induces an electromotive force (EMF) in a conductor.

• Magnetic induction is the process of creating a magnetic field in a conductor.

• Magnetic induction is the process of converting magnetic energy into electrical energy.

• Magnetic induction is the process of generating a static magnetic field in a conductor.

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What is the unit of measurement for magnetic field strength?

• Gauss (G)

• Newton (N)

• Ampere (A)

• Tesla (T)

How can you increase the strength of an electromagnet?

• Use a core material with lower magnetic permeability

• Decrease the number of turns in the coil

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

• Decrease the current flowing through the coil

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What is the difference between ferromagnetic and paramagnetic materials?

• Ferromagnetic materials have magnetic moments that align randomly and only become magnetic in the presence of an external magnetic field.

• Paramagnetic materials have permanent magnetic moments that align parallel to each other in the absence of an external magnetic field.

• Ferromagnetic materials do not exhibit any magnetic properties.

• Ferromagnetic materials have permanent magnetic moments that align parallel to each other in the absence of an external magnetic field, while paramagnetic materials have magnetic moments that align randomly and only become magnetic in the presence of an external magnetic field.

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State the right-hand rule for magnetic fields.

• The right-hand rule for magnetic fields only applies to AC circuits.

• If you point your thumb in the direction of the magnetic field, then the direction your fingers curl around a wire will indicate the direction of the current flow.

• The magnetic field is always perpendicular to the direction of the current flow.

• If you point your thumb in the direction of the current flow, then the direction your fingers curl around a wire will indicate the direction of the magnetic field created by that current.

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How does Earth's magnetic field protect us from solar wind?

• The Earth's magnetic field absorbs solar wind

• The Earth's magnetic field deflects charged particles from the solar wind.

• The Earth's magnetic field creates solar wind

• The Earth's magnetic field amplifies solar wind

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