PHYSICS 240 Final--Spring 2001-1

PHYSICS 240 Final--Spring 2001-1 - Physics Spring 240 2001...

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Physics 240 Spring 2001 Final Exam 1. Twoparticles, X and Y, are4 m apart.Xhasacharge otzQand Y has achargeof Q.Theratio of the magnitude of the electrostatic force on X to that on Y is: Ns^,\o1'1 J,-A Low A) 4:1 B) 2:I 9) 1:1 D\ r:2 E) L:4 2. A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force on the positive charge is: AL B) c) D) E) A) B) c) D) E) 9.0 x 108 N toward the negative charge \=-___% 9.0x .l 0sN awafFffiffi n'6EiiiVilcharge 9.0 x 10e N toward the negative charge 9.0 x 109 N away from the negative charge none of these f. 4,1, *.t trtd,fr - 3. Choose the correctstatement concerning electric field lines: a.goi. Jine, none of these are correct fie*d#nos'ma*ereso field lines are close where the field is laree Page I
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Physics 240 Spring 2001 Final Exam 4. The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z).Then: / \ I I L I I \tjY+\)4tlx +f y4l--+-( /.)---a1- / r h - i , \ - . / r \ \ \ t + t l \ . *3* ulx/ rt v o ' }I Y is negative andZis positive B\ the magnitude of the electric field is the same everywhere C) the electric field is strongest midway between Y andZ p) a small negatively charged body placed at X wouldbe pushed to the right -q V andZmust have the same sign 5. A point charge is placed at the center of a spherical Gaussian surface. The electric flux OB is changed if: the sphere is replaced by a cube of the same volume the sphere is replaced by a cube of one-tenth the volume the point charge is moved off center (but still inside the original sphere) the point charge is moved to just outside the sphere a second pointcharge is placedjust outside the sphere 6. Charge is distributed uniformly along a long straight wire. The electric field2 cm from the wire is 20 N/C. The electric field 4 cm from the wire is: A) 120 N/C B) 80 N/C c) 40 N/c _D) r0 N/c E) s N/C xJ B) cI D) EI Page2
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V l^J. 1 Physics 240 Spring 20Ol Final Exam $1. If 500 J of work are required to carry a 40-Ccharge from one point to another, the potential difference between these two points is: A) l2.s v B) 20,000 v c) 0.08 v D) depends on the path E) none of these 2 V 0.2v 5 V 0.5 v none of these $t-v*: !'ttl bL'U flzu' : T V f v ' '\Fs)(tor) [' J Q v A) B) c) D) E) c'$qcu f S. During a lightning discharge, 30 C of charge move through a potential difference of 1.0 x 108 V in 2.0 x IF s. Theenergy released by thislightning bolt is: / N*b(yoo:&8v S*su*,kqu#'&' A) 1.5 x 1011 J B) 3J9x 10qJ . C) 6.0 x 107 J D) 3.3 x 106 J E) 1s00 J \^l'- tV ' 9. To charge a l-F capacitor with 2 C requires a potential difference of: c.-9 u = 8 , + " J v 10. Az-rd. and a 1-,aF capacitor are connected in series and a potential difference is applied across the combination. The 2-1ts capacitor has: I rrqD' Q t",,4att,o,d ) Q Eu {erng A) twice the charge of the l-pF capacitor B) half the charge of the l-pF capaciror I fli ;n C) twice the potential difference of the l-prF capacitor ' ' r l-' D) lulljhr- potential difference of the f1S capacitor CJ'nt t'bf E) iloGof the above lJ , g V = Q C ,tn{ U, g r/.Av Jur v.j ft\l fr Page 3
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Physics 240 Spring 2001 Final Exam 1.1. Current is a measure of:
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