11/5/2023 0 Comments Foam bubble nailsSince the electrons can’t leave the pie pan because it is completely surrounded by insulating air and foam, the pan remains neutral. When you place the pie pan on the foam plate, the electrons on the foam repel the electrons on the pan. ![]() Plastic foam or Styrofoam TM is an insulator it will hold its charge until it is discharged by current leaking into the air or along a moisture film on its surface. ![]() By using an electroscope (such as the one you can build with our Electroscope activity), you can determine whether the foam is positively or negatively charged. If it does, you will have to rub the plate long enough to cancel this initial charge before you can begin building a sizable negative charge. Often, a plate fresh from the package will start with a positive charge. That’s because the foam attracts electrons from the cloth. When you rub the foam plate with a wool cloth, you charge it negatively. Discharge the jar by touching the aluminum foil with one finger and the nail with another. You can make several charge deliveries by recharging the pan before again touching it to the nail. The pie pan is portable and can be used for many electrostatic experiments.Ĭharge the Leyden jar by touching the charged pie pan to the nail while holding the Leyden jar by its aluminum-foil covering. After charging the foam plate once, you can charge the pie pan several more times without recharging the plate. To make the largest spark when discharging, have the pie plate at least one foot (25 centimeters) away from the foam plate. You’ll hear a snap, feel a shock, and, if the room is dark, see a spark. You can discharge it by touching it with your finger. You may have to hold the foam plate down with your other hand. Remove the pie pan by holding only the foam-cup handle.Briefly touch the pie pan with your finger.Using the foam-cup handle, place the pie pan on top of the charged foam plate. ![]() Then charge the pie plan by following the next steps exactly: If this is your first time using the foam in an electrostatic experiment, rub it for a full minute. Rub the upside-down foam plate with the wool cloth.
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