Read each item carefully. Choose the letter of the correct answer.
1. Why is the wire used in electromagnet coiled?
a. It has more force.
b. It controls the flow of electricity.
c. It controls the field of attraction.
d. It makes electromagnet stronger.
2. Which of the following can make electromagnet stronger?
a. by adding more dry cells
b. by increasing number of turns in the coil of wire
c. by using a core with bigger diameter.
d. All of the above
3. Which of the following devices make use of electromagnets?
a. Telephone
b. Electric bell
c. Electric buzzer
d. All of the above
4. Which of the following is NOT a part of electromagnet?
a. Coiled wire
b. Dry cell as source of electricity
c. The pins attracted by the electromagnet
d. The nail as core
5. What happens when part of electromagnet is disconnected?
a. It loses its magnetism
b. Electricity continues to flow through it.
c. The electromagnet becomes a permanent magnet
d. There is an increase in the number of materials attracted.

6-10. Draw a device using electromagnet. Then, explain how it can be useful in home,
school, or community