Eisco-Parallel-Plate-Capacitor-Demonstration-Eisco-PH0879-P-This-demonstration-capacitor-consists-of-two-120mm-circular-metal-discs-mounted-on-insulated-supports-that-slide-on-a-track-to-adjust-the-distance-between-them-The-distance-can-be-easily-measured-by-reading-their-respective-positions-on-the-fixed-scale-P-P-The-apparatus-allows-students-to-observe-the-principle-of-capacitance-its-relationship-with-charge-&-voltage-its-dependence-on-the-surface-area-of-conductors-&-the-diele