Exam 1--Winter 2000 - This is the first exam Page1 of9 is...

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This is the first exam Page 1 of9 This is the first exam. The answers to each question are highlighted, and a brief explanation is given. Your versionof the exam may be different, you haveto find the answer on your exam,you cannot just usethe letters from the anwerkey. The percentage of students giving the correct response to each question is shown. Note that questions that have less than 507o correct response are likely to reappear on the final exam. 1. The diagram shows two pairs of heavily charged plastic cubes. Cubes I and? attract each other and so do cubes I and 3. which of the followins illustrates the forces of 2 on 3 and 3 on2? A ) I B) III C ) V D) II Correct E) IV Since both 2 and 3 are attracted to 1 they must have the same charge. They will repel each other. 93% 2. A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball,which is observed to be attracted to the rod. This is because: A) the ball becomes positively charged by induction B) the ball becomes negatively charged by induction C) the number of electrons in the ball is more than the number in the rod D) the string is not a perfect insulator E) there is a rearrangement of the electrons in the ball Correct A charged object polarizes a neutral object by causing the charges in the neutral object to move. 1 1 l -T- ti_l l-.1 -r /t t3 + t3 tr V l-'l -r l 3 | bT_ v IV t'] T' f l 3 l ilt ,t, ll_i tr $ tl + E_t .h LI I http ://hep/physics240-w00/exams/EXAM 1 answers.htm 88"/" rr/zu2002
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rhe first exam Page2 of 9 3. Two particles, X and Y, are4mapart. X has acharge of 2Q and Y has a charge of Q. No other charges are nearby. Theratioof the magnitude of the electrostatic force on X to that on Y is: Newtons Third law - equal and opposite forces. 86%
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