8. In which of the following
the following materials can you make a stronger
electromagnet?

A. one with 20 coils, 2 dry cells, wood as core
B. one with 20 coils, 1 dry cell, 1 big iron nail
C. one with 20 coils, 2 dry cells, plastic as core
D.one with 20 coils, 1 dry cell, 1 small iron nail

9. What will happen when electricity stops flowing through a coil of wire?

A. The core will burn.
B. Nothing will happen to the core.
C. The core will stop attracting metal.
D. The core will continue attracting metal.

10. Which of the following materials uses an electromagnet?
A. ball and bat
B. pen and paper
C. fork and spoon
D. telephone and radio

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