23-24 Unit 2 Practice Test

A permanent bar magnet is surrounded by magnetic field lines. Describe the direction of its magnetic field lines.

• From the north pole of the magnet to its south pole
• From the south pole of the magnet to its north pole
• Upwards from a central point between the poles
• Directly outwards from the south pole

What do electric force and magnetic force have in common?

• They move atoms
• They create fields
• They are easily destroyed
• They are created by humans
• They are the same

The diagram is of an object that produces electricity. What item is the magnet?

• A
• B
• C
• D

Noah built the object pictured here. What did he create?

• Electric current
• Magnetic field
• Protons
• Electromagnet

Identify the types of fields that produce motion in an electric generator.

• An electric field and gravitational field
• A magnetic field and electric field
• Two electric fields
• Two magnetic fields

Which of the following will attract each other?

• The north pole of a magnet and the south pole of another magnet
• The north pole of a magnet and the north pole of another magnet
• The south pole of a magnet and the south pole of another magnet
• All of the above
• None of the above

How do you increase the magnetic field of an electromagnet?

• Increase the number of coils
• Decrease the number of coils
• Remove all of the coils
• Remove the magnet

Which of the following best represents Earth’s magnetic field?

• A
• B
• C
• D

Which items are not needed to create an electromagnet?

• Iron nail and copper wire
• Magnet and pulley
• Copper wire and battery
• Battery and iron nail

Inside of a music speaker, a wire coil is wrapped around an iron core. The wire is attached to a source of electric current that can be turned on and off. As the current is turned on or off, it interacts with a permanent magnet nearby. What type of instrument is used to make the speaker work?

• Electromagnet
• Motor
• Battery
• Solar panel