Review: Electromagnetism Rules

• Using thinner wire

• Using a smaller current

• Increase the resistance of R

• Increasing the number of turns of solenoid

The attraction or repulsion created by spinning electric charges

• A. electric generator

• B. magnetic force

• C. solenoid

• D. electromagnet

A device that converts mechanical energy into electrical energy

• A. electric generator

• B. electric motor

• C. electromagnetic induction

• D. electric meter

If you wrap more coils around an electromagnet, it will become 

• brighter
• stronger
• weaker
• invisible

A compass needle responds to a magnetic field, because the compass needle is a

• A. generator.
• B. motor.   
• C. magnet.
• D. transformer.

The ability of some materials to attract certain metals is called

• Electricity
• Magnetism
• Electromagnetism
• Atoms

These magnetic domains are:

• strongly magnetized

• slightly magnetized

• unmagnetized

Are the magnetic field lines in the picture correct?

• Yes, because they point from north to south.

• No, because they point from north to south (they're supposed to go the other way).

• Yes, because the North pole is on the left in all pictures.

• No, because the North pole is on the left in all pictures (it's supposed to be on the right).

When running a current through a wire, what do the blue lines represent?

• The wire spinning

• A magnetic field that was created

• Electrons leaving

• Electricity

What conclusion can you draw from this graph?

• As current increases, magnetic strength decreases.

• As current increases, magnetic strength increases.

• As current decreases, magnetic strength increases.

• There is no relationship between current and magnetic strength.