Science 5 - Electromagnets

1. An electromagnet function when __________.

• A. you put a bulb into it

• B. electricity flows through it

• C. two objects are rubbed together

• D. you use a horseshoe magnet

2. When an electromagnet is turned off, it __________.

• A. becomes a permanent magnet

• B. increases its magnetic field

• C. loses its magnetism

• D. retains its magnetism

3. Which of the following factors does NOT affect the strength of an electromagnet?

• A. The type of wire used

• B. The color of the wire

• C. The amount of current flowing through the wire

• D. The number of coils of wire

4. What is the primary purpose of an electromagnet?

• A. To convert mechanical energy into electrical energy

• B. To generate electricity

• C. To create a magnetic field when current flows

• D. To store electrical energy

5. Which material is commonly used as a core for an electromagnet to enhance its magnetic field?

• A. Aluminum

• B. Iron

• C. Copper

• D. Plastic

6. How can the strength of an electromagnet be increased?

• A. By increasing the number of coils

• B. By using a thinner wire

• C. By decreasing the current

• D. By decreasing the number of coils

7. What happens to the magnetic field of an electromagnet when the current is increased?

• A. It increases

• B. It becomes unstable

• C. It decreases

• D. It remains the same

8. What is the effect of adding more turns of wire to an electromagnet?

• A. It increases the strength

• B. It decreases the strength

• C. It makes it permanent

• D. It has no effect

9. Ma'am Gerleeh wants to create an electromagnet. What materials should she prepare?

• A. a nail, battery and a piece of wire

• B. a bulb, battery and a piece of wire         

• C. a switch, piece of wire and a nail

• D. a battery, a switch and a piece of wire

10. Which of the following electromagnets can attract the most number of thumb tacks?

• A. one with 50 coils

• B. one with 70 coils

• C. one with 80 coils

• D. one with 100 coils