Which of the following groups of materials would most likely be used to build an electromagnet?
A bare wire, plastic rod, battery
B. bare wire, iron rod, light bulb
Cinsulated wire, iron rod, battery
D. insulated wire, plastic rod, light bulb

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.