ay
10. Which makes an electromagnet work?
Needle
B. electricity
C-pin
D. thumbtacks
11. Which of the following can make an electromagnetic stronger?
A. Increase the number coils of the wire
C. Use a bieger core
B. Add more dry cell
D. All of the above
12. Which device makes use of electromagnet?
A telephone
B. electric buzzer
C. electric bell D. all of the above
13. Which is a part of an electromagnet?
A wire B. pin C. thumbtacks D. needles
14. Which of the following is a conductor in an electromagnet?
A. Copper B. rubber C plastic D. wood
15. Which is NOT part of an electromagnet?
A. magnet
B. wire
C. nail
D. battery
16. Which activity uses an electromagnet?
C lighting a room
D. cooking
B. using a door bell
A. polishing the floor
17. In constructing an electromagnet, which material do you need?
A. dry cell
B. wire
Ciron nail
D. all of the above
18. What happens when one end of the wire is disconnected from the dry cell?
A. Electricity continues to flow.
B. Magnetism is gone.
C. The electromagnet becomes permanent.
D. It becomes stronger.
electromagnet?​