hw2 - Solution for Homework 2 Simple Electric Devices and...

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Unformatted text preview: Solution for Homework 2 Simple Electric Devices and Processes Solution to Homework Problem 2.1(Static Cling) Problem: Clothes sometimes cling together after being removed from the clothes dryer. Why? Select One of the Following: (a) Because the rubbing in the dryer gave them all the same positve charge so they stick together. (b-Answer) The rubbing in the dryer made the clothes have different sign charges and thus they stick together. (c) Clothes never stick together when they come out of the dryer. (d) Because left over soap from the wash when heated forms a sticky resin that makes cloths stick together. (e) The rubbing of the dryer makes clothes all gain a negative charge which causes them to stick to each other. Solution When the dryer tumbles the clothes around, they rub together, removing electrons from some articles adding electrons to others. Most clothing is made of dielectric materials, so any net charge on the clothes stays put. Some articles will gain a net negative charge, others will gain a net positive charge. Since opposites attract, two pieces of clothing with opposite net charges will cling together. Total Points for Problem: 3 Points Solution to Homework Problem 2.2(Uncharged Bits of Paper and Determining the Sign of Charge on an Object Used to Induce a Charge in Another Object) Problem: Consider two bits of paper. (a)If we state that two bits of paper are electrically neutral, which of the observations could be made to verify this is the case? Select One of the Following: (a) Paper is attracted to a positively charged rod. (b-Answer) Paper is attracted to both a positively and negatively charged rod. (c) Paper is attracted to a negatively charged rod. (d) Paper is repelled from a negatively charged rod. (e) Paper is repelled from both a positively and negatively charged rod. (f) Paper is unaffected by both a positively and negatively charged rod. (b)The neutral paper bits are attracted to a charged object. Can this observation be used to determine whether the charged object is positive or negative? Why or why not? Select One of the Following: (a) Yes, because opposite charges attract. (b) Yes, because like charges attract. 1 (c-Answer) No, because both positively and negatively charged objects attract neutral objects. (d) No, because both positively and negatively charged objects repel neutral objects. (e) No, because both positively and negatively charged objects have no effect on neutral objects. Solution to Part (a) If the paper bits are uncharged, then there is no mutual attraction or repulsion. An uncharged object will be attracted to both a positively and negatively charged object....
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This homework help was uploaded on 04/19/2008 for the course PHYS 2074 taught by Professor Stewart during the Spring '08 term at Arkansas.

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hw2 - Solution for Homework 2 Simple Electric Devices and...

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