Describe two ways that you can give an electroscope a positive charge. Conduction and Induction; Electroscope Classwork A student has a positively charged glass rod but she wants to charge an electroscope negatively. What should she do to accomplish that? Why does that work? A student brings a negatively charged plastic rod near a tiny piece of paper that is resting on a tabletop. Will the paper be attracted or repelled? Explain why. Why is it that when you take off a sweater in a dark room you can see tiny sparks and hear a crackling sound? Homework A positively charged rod attracts a metal ball suspended at the end on an insulating string. Explain the mechanism of attraction. An electroscope (insulated from ground) is charged negatively and a charged rod is brought very close but does not touch the electroscope. As a result the leaves move further apart. What kind of electric charge is on the rod? Two light paper strips are suspended at the ends of two insulating strings, and are far apart from each other. One paper strip is charged and the other is not charged. Design an experiment to determine which strip is charged. A student touches an electroscope with his hand at the same time he brings a positively charged rod close to the electroscope without touching. When he removes his hand first and then moves the rod away from the electroscope the leaves move apart. Why? What type of charge is on the leaves? Electric Force (Coulomb’s Law) Classwork Will two charged objects interact on the Moon, where there is no atmosphere?
Describe two ways that you can give an electroscope a positive charge. Conduction and Induction; Electroscope Classwork A student has a positively charged glass rod but she wants to charge an electroscope negatively. What should she do to accomplish that? Why does that work? A student brings a negatively charged plastic rod near a tiny piece of paper that is resting on a tabletop. Will the paper be attracted or repelled? Explain why. Why is it that when you take off a sweater in a dark room you can see tiny sparks and hear a crackling sound? Homework A positively charged rod attracts a metal ball suspended at the end on an insulating string. Explain the mechanism of attraction. An electroscope (insulated from ground) is charged negatively and a charged rod is brought very close but does not touch the electroscope. As a result the leaves move further apart. What kind of electric charge is on the rod? Two light paper strips are suspended at the ends of two insulating strings, and are far apart from each other. One paper strip is charged and the other is not charged. Design an experiment to determine which strip is charged. A student touches an electroscope with his hand at the same time he brings a positively charged rod close to the electroscope without touching. When he removes his hand first and then moves the rod away from the electroscope the leaves move apart. Why? What type of charge is on the leaves? Electric Force (Coulomb’s Law) Classwork Will two charged objects interact on the Moon, where there is no atmosphere?
ap-phys1_electric-force-and-field-practice-problems_2017-03-21.docx