S8P5 Test Review

An electromagnet is a magnet that

• Its strength can be varied and turned on and off

• always has a magnetic field around it

• has very litle strength

• all of these

What are the components of the electromagnets?

• battery, wire, and bulb

• battery , copper wire and paper clips

• battery, copper wire and iron nail

• battery, wire and aluminum

What do two unlike poles do when they are brought close together?

• nothing

• attract

• repel

• decrease

What is an example of a conductor?

• A wooden block

• A plastic fork

• Copper wire

• A styrofoam cup

Which statement best describes an insulator?

• A material that allows electricity to flow through it

• A material that does not allow heat to flow through it

• A material that does not allow liquids to flow through it

• A material that cools down quickly when heated

Which part of the Magnet is Strongest?

• Poles

• Center

• Sides

• It's all the same

How could you make electromagnet stronger?

• adding more loops of wire

• increasing the amount of wires

• decreasing the size of the iron core

• None of the above

Which of the following is an insulator?

• Glass

• Human Body

• Copper

• Conductor

• Insulator

If two charges repel each other, the two charges must be

• Positive and neutral

• Positive and negative

• negative and negative

• negative and neutral