Magnetism Practice

The function of an electric motor is to change ____.

• chemical energy to electrical energy

• electrical energy to chemical energy

• electrical energy to mechanical energy

• mechanical energy to electrical energy

The function of a generator is to change ____.

• chemical energy to electrical energy

• electrical energy to chemical energy

• electrical energy to mechanical energy

• mechanical energy to electrical energy

The region around a magnet where the magnetic forces act is the ____.

• electromagnetic

• magnetic domain

• magnetic field

• magnetic pole

The location of the strongest magnetic forces is the ____.

• electromagnets

• magnetic domains

• magnetic fields

• magnetic poles

As the number of turns of wire on an electromagnet is decreased, the pole strength of the electromagnet

• decreases

• increases

• remains the same

An electromagnet would have the greatest strength if its wire were wrapped around a core made of

• wood

• iron

• aluminum

• copper

In the diagram, a steel paper clip is attached to a string, which is attached to a table. The clip remains suspended beneath a magnet. As the magnet is lifted, the paper clip begins to fall as a result of

• an increase in the potential energy of the clip

• an increase in the gravitational field strength near the magnet

• a decrease in the magnetic properties of the clip

• a decrease in the magnetic field strength near the clip

Which diagram correctly represents the direction of the magnetic field around a bar magnet?

• a.

• b.

• c.

• d.

In the diagram shown, at which point is the magnetic field strongest?

• A

• B

• C

• D

If the current through a coil of wire is decreased, the magnetic field strength of the wire coil will

• decrease

• increase

• remain the same