Magnetism & Electricity

Four items are placed the same distance from the magnet.  Which one of the objects will be the easiest for the magnet to pull?

• eraser
• iron nail 
• aluminum can
• piece of paper

Which best shows a complete circuit? 

• F
• G
• H
• J

Some students want to conduct an experiment to test electrical charges. They have some small pieces of paper and a plastic straw. Which activity will show an electrical charge between two materials? 

• Rub the pieces of paper together and blow on them through the straw. 
• Rub the straw on hair and hold it close to the pieces of paper.
• Wet the pieces of paper with the straw. 
• Hold the pieces of paper over the straw. 

A student connected some wire to a battery and a small bulb to make a simple circuit. Energy from the battery is changed into electricity in the circuit. What type of energy is stored in the battery? 

• chemical
• nuclear
• heat
• light

Students made an electromagnet by wrapping a wire around an iron nail and attaching the wire to a battery as shown below.  Which object will be attracted to the electromagnet? 

• metal bar
• plastic fork
• ceramic mug
• wooden ruler

A student has the following electromagnet.  What can the student do to make the electromagnet stronger?  

• The student can add more coils to the nail.
• The student can add a switch to the setup.
• The student can replace the nail with a longer nail.
• The student can replace the nail with a piece of wood.

A student rubbed a balloon on her head. The student then held the electrically charged balloon over some small pieces of paper.  
What will most likely happen to the small pieces of paper? 

• The pieces will stick to the table. 
• The pieces will scatter around the table. 
• The pieces will be attracted to the balloon. 
• The pieces will move away from the balloon. 

Which diagram shows a complete electrical circuit? 

• F
• G
• H
• J

A student stacked three magnets on each other. Which diagram shows the three magnets attracted to each other? 

• A
• B
• C
• D

What will happen when a balloon with a negative charge touches a wall with a positive charge?

• The balloon will bounce off the wall.
• The balloon will explode.
• The balloon will stick to the wall.
• The balloon will become positively charged.