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8. Which of these increase the strength of electromagnets?
1. Increase the number of coil
III. Decrease the number of dry celt
II. Increase the size of dry cell (battery)
IV. Decrease the number of coll
A. I and III
B. II and III
C. I and II
D. III and IV
9. An electromagnet is a
magnet
A. Permanent
B. Parallel
c. Temporary
D. Series
10. What happens when you disconnect an electromagnet from a battery?
A. It will explode.
C. It will stop from attracting metals.
B. It will continue from attracting non-metals
D. Nothing will happen.