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 version of the exam may be different, you have to find the answer on your exam, you cannot just use the letters from the anwer key. The percentage of students giving the correct response to each question is shown. Note that questions that have less than 507o correct 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 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 by induction B) the ball becomes negatively 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 to move. 11l -T- ti_l l-.1 -r /t t3 + t3 tr V l-'l -r l3 | bT_ v IV t'] T' f l3l 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. The ratio of the magnitude of the electrostatic force on X to that on Y is: A) 4:T B) 2:I C) 1:1 Correct D) L:2 E) I:4 Newtons Third law - equal and opposite forces. 86% 4. A2-1tC charge is placed at the origin, an identical charge is placed 2 m from the origin on the x axis, and a third identical charge is placed 2 m from the origin on the y axis. The magnitude of the force on the charge at the origin is: I A) 9.0x10-3 N B) 6.4x10r N C) 1.3x10'2 N D) 1.8x10-2 N E) 3.6x10-2 N The force on the charge at the origin due to the charge on the x axis is ke,e. f =--# r" This is the same force due to the charge on the y axis. The forces add as vectors, and since the two forces are at right angles total force is 69% 5. Electric field lines: A) form closed loops B) are trajectories of a test charge C) cross each other in the
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This note was uploaded on 04/01/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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

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