Parallel Plate Capacitor

A pair of aluminium circular disc mounted on adjustable insulated supports sliding in aluminium rail. A scale of length 15 cm graduated in millimeter attached on one side of the aluminium rail to determine the distance between the plates. Circular plates connected with termils to apply voltage through power supply. A aluminium frame with a glass sheet is also provided with it to show effect of dielectric material between two plates which can freely move inside the aluminium rail.