Which focus question is the author trying to answer?
c
Read the introduction from a science website
Electromagnetic force sounds very complicated, but I
wanted to understand how it works My experiment allowed
me to create my own electrical field using a nine-volt
battery, an iron nail, and some paperclips This experience
helped me understand electromagnetism and the way it
works
O How does a nine volt battery work?
O How does electromagnetic force work?
O How much electricity is stored in a battery?
O How much iron is contained in paperclips?