Learning Task 5. Read each item carefully. Choose the letter of your answer.

1. Why is the wire used in an electromagnet coiled?
a. It has more force.

b. It controls the flow of electricity.

c. It controls the field of
attraction.

d. It makes the electromagnet stronger


2. Which of the following can make an electromagnet stronger?
a. by adding more dry cells

b. by increasing the number of turns in the coil of wire

c. by using a core with a 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 one of the following is not a part of an electromagnet?
a. the coiled wire

b. The dry cell as the source of electricity

c. the pins attracted by the electromagnet

d. the nail as the core


5. What happens when a part of an electromagnet is disconnected?
a. It loses its magnetism

b. electricyty continues to flow through it.

c. the electromagnet becomes a permanent magnet.

d. there is an increase in the number of materials attracted
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