16. If you break a magnet into pieces, the forced
a stay the same cincrease
b. decrease
d. get stronger
17. Magnets have invisible
a. magnetic field c.sound waves
b. electric current d. signals
18. The place where magnetic force of a magnetis strong
a. ends
c. sides
b. edge d. all parts
19. The force exerted by a magnetis
a push only
c. push and put
b. pull only
d. no force
20. All magnets have the same
a. colors
c. sizes
b. properties d. shapes​