An electrophorus is a flat metal plate with an insulating handle. an electroscope is a device for detecting charge. in this part of the activity, you will charge the electrophorus and the golf tube, and use the electroscope to demonstrate the effects of induction and grounding at your station you will find an acrylic cutting board. charge up the cutting board by vigorously rubbing it with the oven-roasting bag. determine the sign of the charge on the cutting board by testing it against the charged white and clear rods. does it carry a positive (+) of negativ ) charge? (circle one) place the electrophorus on the cutting board. r9: what effect does the charged cutting board have on the electrons in the metal pie remember how the charge behaved in the soda can. pan ? lift the electrophorus up by the handle and slowly bring your knuckle to the rim of the pie pan. r10: record your observation: 9c return the electrophorus to the cutting board. this time touch the pie pan while it is on the cutting board and then lift it up by the handle without touching the metal. again, slowly bring your knuckle to the rim of the pie pan. r11: record your observation: draw a series of pictures to represent the process of charging up the electrophorus. clearly indicate the sign of the charge, where the charge is, when charge is transferred, and where the charge goes. charge up the electrophorus and bring it near the electroscope without making contact. pull it away r12: record your observation.