Electricity and Magnetism

Mrs. Ellis rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

• The balloons will repel each other.

• The balloons will attract each other.

• The balloons will become positively charged.

• The balloons will pop.

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When socks get stuck to towels in your dryer, this is an example of __________________________.

• current electricity

• static electricity

• magnetism

• electromagnetism

What is the major difference between static electricity and current electricity?

• Current electricity involves a continuous flow of neutrons; static electricity is a sudden transfer of protons.

• Current electricity can be dangerous, while static electricity is always safe.

• In current electricity, there's a single transfer of electrons; in static electricity, there's a steady flow of electrons.

• Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons.

What is the continuous movement of electrons called?

• static eletricity

• current electricity

• friction

• magnetism

A magnet created by an electric current is called a(n) ________________________.

• current

• electricity

• electromagnet

• circuit

Look at the drawing. If you tried to move these two magnets closer together, what would happen?

• They would move together quickly and easily because like charges attract.

• They would try to push apart because like charges repel.

• They would try to push apart because magnets always push apart at the poles.

• They would neither push apart nor attract because magnets do not have any effect on other magnets.

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Which of these materials will a magnet attract?

• plastic

• iron

• rubber

• wood

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The area around a magnet where the magnet's force can pull on other objects is called its _________________________.

• magnetic field

• force field

• magneticism

• gravity

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Which of the following is caused by static electricity?

• a stove getting hot when it is turned on

• a magnet being attracted to a refrigerator

• a lightning strike during a storm

• a light bulb coming on when a switch is turned

What happens to the strength of an electromagnet when you add more coils?

• The electromagnet becomes weaker.

• The electromagnet becomes stronger.

• There is no change to the electromagnet's strength.

• The electromagnet becomes stronger in the middle, and the poles become weaker.

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