Charge indicator rvfm sep 015 p this charge indicator allows easy and rapid investigation of electrostatic charges when it is moved towards a charged object one or other of the leds will light up red indicates that the object is positively charged and green indicates that it is negatively charged p p when for example a polythene rod is rubbed using a piece of cloth the green led comes on when it is brought near the polythene and red near the cloth this demonstrates how negative c