From Barry Hopkins at Severna Park High School
"I use the inexpensive clear plastic storage containers (shoe box size) from the dollar store and a couple of 9 volt batteries. Small pieces of copper wire and aluminum strips are placed into the tubs and water in the various configurations shown on page 3 of the Word document. We eventually print out each group’s results and make copies for everyone, and they use the equipotentials to help them trace out the electric fields.
If you’ve never done this before, you’ll find it’s extremely tedious and time-consuming, so I usually get them to come after school (for some extra credit) to collect the data, rather than waste valuable class time."