WHAT'S MORE
Direction: Encircle the letter of the correct answer.
1. Which material can be a conductor for an electromagnet
a. copper
C. plastic
b. cotton
D. rubber
2. Which object is not used in making an electromagnet?
a core
C. magnet
b. electricity
D. wire
3. Manny wants to increase the strength of an electromagnet. What should
Manny do?
a. Decrease the amount of electric current.
b. Increase the turns of the wire.
C. Remove the iron core.
d. Stop the flow of electricity.
4. How does an electromagnet work?
a. An electromagnet behaves like magnet only when the wire is wrapped
around an iron core
b. An electromagnet maintains its magnetic properties even without the
source of electricity
c. When an insulated wire is wrapped around an iron rod, the rod
becomes magnetized
d. When electric current flows through the wire wrapped around an iron
core
5. David wants to construct an electromagnet. He has a long piece of iron
wire and two dry cells. What other material he needs?
a, iron screw
C. glass tube
D. wooden stick
b. plastic tube​