Activity 2. Read each item carefully. Write the letter of the correct answer on the blank
before each number.
1. Which of the following devices makes use of an electromagnet?
A door bell
B. dry cell
C. flashlight
D. switch
2. A crane uses
to lift big pieces of iron.
A. electromagnet B. natural magnet
C. ordinary magnet
D. plastic
3. Which of these inceases the strenght of electromagnets?
A. decreasing the number of loops of wire around the iron core
B. decreasing the size of the iron core
C. increasing the number of loops of wire around the iron core
D. turning the current off
What kind of magnet is an electromainet?​