Electricity and Magnetism — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which object would a magnet most likely attract?
A) A plastic ruler
B) A wooden pencil
C) A steel paper clip
D) A rubber eraser
Steel paper clips contain iron, so magnets attract them.
2. Which is an example of a non-contact force?
A) Kicking a soccer ball
B) A magnet pulling a nail from across the table
C) Pushing a door open
D) Lifting a box with your hands
A magnet pulling a nail across a gap is magnetism, a non-contact force.
3. Why does a circuit with an open switch have a dark bulb?
A) The battery is empty
B) The bulb is broken
C) The circuit is open, so electricity cannot flow
D) There are too many wires
An open switch breaks the loop so electricity cannot reach the bulb.
4. Which pair shows materials that are a conductor and an insulator?
A) Copper wire and iron nail
B) Rubber band and plastic cup
C) Copper wire and rubber band
D) Wood block and paper sheet
Copper is a conductor and rubber is an insulator, so they are a correct pair.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A magnet is strongest at its north and south poles.
The magnetic force is strongest at the poles of a magnet.
2. Two south poles pushed together will repel each other.
Like poles (S-S) repel, pushing away from each other.
3. A metal spoon is a conductor because electricity can flow through it.
Conductors like metal spoons allow electricity to flow through them.
4. Rubber gloves keep electricians safe because rubber is a great insulator.
Insulators like rubber stop electricity from reaching the skin.
5. When two magnets pull together without touching, they show a non-contact force.
A non-contact force acts across a gap, as magnetism does.