6. Un all
b. all of the above
18. What happens when one end of the wire is disconnected from the dry cells
A. Electricity continues to flow.
B. Magnetism is gone.
C. The electromagnet becomes permanent.
D. it becomes stronger.
19. Which of the following will be attracted to an electromagnet?
A. pins
B. needles C. thumbtacks D. all the above
20. Which is an example of a temporary magnete
A. bar magnet
B. horseshoe magnet
C. electromagnet
D. magnetite​