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Remember to ground the electroscope, as shown in the first figure above. We are going to charge the electroscope using a charged rubber rod. HOWEVER: Do not touch the electroscope knob directly with the charged rod, or quite possibly you will have retired an electroscope from active service. (Notice the little bits of gold leaf splattered all over the insides of most of the electroscopes from previous misuse.) Rather we will be using what is called a proof plane made of a round metal disk on a plastic handle. This can be used to transfer small amounts of charge from the rod to the electroscope. Use the piece of fuzzy cloth (wool or an appropriate synthetic) to charge the rubber rod by friction. This will charge the rod negatively by giving it some extra electrons. (a) Where do the extra electrons come from?

Remember to ground the electroscope, as shown in the first figure above. We are going to charge the electroscope using a charged rubber rod. HOWEVER: Do not touch the electroscope knob directly with the charged rod, or quite possibly you will have retired an electroscope from active service. (Notice the little bits of gold leaf splattered all over the insides of most of the electroscopes from previous misuse.) Rather we will be using what is called a proof plane made of a round metal disk on a plastic handle. This can be used to transfer small amounts of charge from the rod to the electroscope. Use the piece of fuzzy cloth (wool or an appropriate synthetic) to charge the rubber rod by friction. This will charge the rod negatively by giving it some extra electrons. (a) Where do the extra electrons come from?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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I. Like Charges Repel Remember to ground the electroscope, as shown in the first figure above. We are going to charge the electroscope using a charged rubber rod. HOWEVER: Do not touch the electroscope knob directly with the charged rod, or quite possibly you will have retired an electroscope from active service. (Notice the little bits of gold leaf splattered all over the insides of most of the electroscopes from previous misuse.) Rather we will be using what is called a proof plane made of a round metal disk on a plastic handle. This can be used to transfer small amounts of charge from the rod to the electroscope. Use the piece of fuzzy cloth (wool or an appropriate synthetic) to charge the rubber rod by friction. This will charge the rod negatively by giving it some extra electrons. (a) Where do the extra electrons come from? Next, have your partner transfer some of the electrons from the rod to the electroscope knob using the proof plane. About one scoop full should do it. You may have to mess around a bit. (b) When the rod is electrified, it has extra electrons. Describe the motion of the electrons when the proof plane touches the rod. (c) What do the electrons do when the plane touches the electroscope knob?
Transcribed Image Text:I. Like Charges Repel Remember to ground the electroscope, as shown in the first figure above. We are going to charge the electroscope using a charged rubber rod. HOWEVER: Do not touch the electroscope knob directly with the charged rod, or quite possibly you will have retired an electroscope from active service. (Notice the little bits of gold leaf splattered all over the insides of most of the electroscopes from previous misuse.) Rather we will be using what is called a proof plane made of a round metal disk on a plastic handle. This can be used to transfer small amounts of charge from the rod to the electroscope. Use the piece of fuzzy cloth (wool or an appropriate synthetic) to charge the rubber rod by friction. This will charge the rod negatively by giving it some extra electrons. (a) Where do the extra electrons come from? Next, have your partner transfer some of the electrons from the rod to the electroscope knob using the proof plane. About one scoop full should do it. You may have to mess around a bit. (b) When the rod is electrified, it has extra electrons. Describe the motion of the electrons when the proof plane touches the rod. (c) What do the electrons do when the plane touches the electroscope knob?
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