16. An electromagnet can be made stronger by using _________. *
1 point
only one cell or battery
more cells or batteries
more pins
electricity
Other:
17. When you use 2 or more batteries, then there is a/an ________ in its current. *
1 point
magnetic field
no change
increase
decrease
Other:
18. This is a temporary magnet that may be produced by making electricity flow through a wire coiled around an iron nail. *
1 point
electromagnet
magnetism
electricity
dry cells
Other:
19. Nails can be turned into magnet by_____________. *
1 point
coiling a wire around it and letting the electricity flow into it
coiling a wire around the dry cells or batteries.
coiling dry cells or batteries in the wire
letting the electricity pass through it
Other:
20. How can you increase the strength of an electromagnet? *
1 point
by letting the electricity pass through it
by adding more dry cells or batteries
by adding the more magnets
by adding longer wires
Other:
21. The source of current in an electrical connection. *
1 point
experiment
electrical charges
metal
power source
Other:
22. A piece of nail, spoon, and fork are examples of___ *
1 point
experiment
electrical charges
metal
battery
Other:
23. Somebody holds a metal connected to a closed circuit will feel ____ *
1 point
experiment
electrical charges
metal
battery
Other:
24. The voltage is the unit used in this material. *
1 point
experiment
electrical charges
metal
battery
Other:
25. Observing the result/effect of a material *
1 point
experiment
electrical charges
metal
battery
Other:​