Electromagnetism

The relationship between electricity and magnetism is called _____________.

• Electricity

• Law of Conservation of Energy

• Electromagnetism

• Magnetism

A _______________ is a coil that carries an electric current. 

• Solenoid

• Simple Electric Motor

• Electromagnet

• Generator

What can be done to increase the number of magnetic objects that an electromagnet picks up?

• Make the wire longer

• Remove the nail from the center of the wire

• Increase the number of coils in the solenoid

• Spread the coils out across the nail

The area around a magnet is called the .....

• attraction zone

• work area

• magnetic field

• hot zone

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

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

What is true about electricity and magnetic fields?

• Electricity is needed to create any magnet.
• Electricity always creates a magnetic field.
• Electricity is stronger than a magnetic field.
• Electricity prevents magnetic fields from occurring.

How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs
• Add more light bulbs and/or wire coils
• add more wire coils and/or a switch
• add more wire coils and/or batteries

What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper