Chapter 24 Magnetism

If you break a magnet into two equal parts, what will result?

• The result will be two magnets, each with one magnetic pole

• The result will be two pieces of metal that have lost their magnetic properties

• The result will be two magnets each with two opposite magnetic poles

• The larger piece will retain the magnetic properties, but the smaller piece will not

What does the magnetic flux per unit area represent?

• The strength of a magnetic field

• The direction of iron filings in a magnetic field

• The center of a magnet

• Where the north pole of a magnet is

In an induced magnet, the _____ are aligned.

• electric currents

• magnetic domains

• electrons

• iron filings

What is a galvanometer used to measure?

• strong magnetic fields

• very small currents

• number of coils in a solenoid

• force on a wire in a magnetic field

A wire connected to a circuit and coiled into many spiral loops is known as a _____________.

• Induced magnet

• solenoid

• magnetic moment

• forced electric field

An attractive or repulsive force between charged particles and magnets is known as the ____________________.

• Magnetic field

• electromagnetic force

• charge force

• ferromagnetic force

How is the direction of the force on a current-carrying wire related to the direction of the magnetic field?

• It is equal and opposite

• It is equal and parallel

• It is always perpendicular to the magnetic field

• It is always opposite to the magnetic field

An electric motor relies on a multi-looped wire coil that is mounted on an axle and rotates in an electric field. This coil is known as a(n) _______________________.

• Solenoid

• Armature

• Loop-coil

• Magnetic loop

How is a temporary magnet different from a permanent magnet?

• A temporary magnet's domains do not align with one another, but a permanent magnet's do.

• A temporary magnet is made from a different type of material than a permanent magnet

• A temporary magnet has a weaker magnetic field than a permanent magnet

• A temporary magnet can be turned on and off, but a permanent magnet cannot.

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron