B. Hang an uncharged metal-coated pith ball from an insulating string attached to the wooden dowel.Then charge a piece of tape as in part A of Section I and bring

the tape toward the ball. Describe what you observe. Through careful observations of physical phenomena, scientists develop models, or mental pictures,to account for observations. These scientific models can also be used to predict physical behavior.From observations of electrical phenomena we can develop a model for electric charge.