Magnets and electromagnets

Worksheet: Magnets and electromagnets

Name:Class:

Answer the questions.

1. What do we call the area around a magnet where it can push or pull?
   a) Magnetic circuitb) Magnetic fieldc) Magnetic shieldd) Magnetic surface
2. Where are the magnetic field lines of a bar magnet closest together?
   a) At the middleb) At the polesc) Far from the magnetd) Only on one side
3. Two north poles placed close together repel each other.
   a) Trueb) False
4. Outside a bar magnet, field lines are drawn pointing from which pole to which?
   a) East to westb) North to northc) North to southd) South to north
5. What is a compass needle?
   a) A piece of copperb) A piece of plasticc) A small magnetd) A tiny battery
6. Which geographic direction does a compass needle's north-seeking end point to?
7. Earth behaves as if it has a giant bar magnet inside it.
   a) Trueb) False
8. Which of these metals is magnetic?
   a) Aluminiumb) Copperc) Goldd) Nickel
9. Which list contains only magnetic metals?
   a) Cobalt, gold, aluminiumb) Iron, copper, zincc) Iron, nickel, cobaltd) Nickel, silver, tin
10. All metals are attracted to magnets.
    a) Trueb) False
11. What is an electromagnet?
    a) A magnet made by electric currentb) A magnet made by heating ironc) A magnet made from plasticd) A magnet that needs no energy
12. Which core is best for a simple electromagnet?
    a) A copper nailb) A plastic rodc) A wooden stickd) An iron nail
13. What happens to an electromagnet when the current is switched off?
    a) It becomes strongerb) It loses its magnetismc) It turns into irond) Its poles swap forever
14. Which change makes an electromagnet stronger?
    a) Fewer turns of wireb) More turns of wirec) Using a weaker batteryd) Using a wooden core
15. Name one change to the current that makes an electromagnet stronger.
16. How can you reverse the poles of an electromagnet?