physics exam1 - Introductory Physics 029:082 Dr Bryce EXAM...

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Unformatted text preview: Introductory Physics 029:082 Dr Bryce EXAM 1 February 181h 2009 Name: Student ID number: Please provide the answer to each question in the area directly below each question. ' You may use the blank pages for working. If more paper is required it will be provided by the proctors. Only eligible answers will be graded. This paper and any additional paper must be turned in at the end of the exam period. This paper will be kept by the instructor. it will not be returned to the student. The student may view the graded paper in the instructor‘s office. Each question is worth one mark unless otherwise stated. Please refer to the attached equation sheet when necessary. The maximum allowable time is 50 minutes. Equation sheet Standard prefixes Giga G l 09 Mega M l 06 Kilo k 103 Cenli c - lO-2 Milli m 10*3 Micro u 10-6 Nano n 10-9 if ax2+bx+c==0 then x: —b :I: «Ibz — 4ac 20 Area of a circle = M2 Circumference of a circle = 2m Surface area of a sphere =41er _ Volume of a sphere = 4/31fr3 Physical constants A‘l radian = 57.300 g ‘—- 9.8m/s2 e = 1.6xlO-l9C k = 8.99 x lOS’NmZIC2 so = 8.85xl 0'12C2/ [Nm2) N0 = 6.031023 pariicles/mal Mp = l.67xlO-27kg Me=9.llxlO'3lkg l. The force of repulsion between two charges is l.8N when the charges are 3.0mm apart. It the charges have the same magnitude what is that magnitude? ' q- 1 F= if; (La/Er r R 2. A parallel plate capacitor contains a uniform electric field of magnitude 6.0N/C. what is the potential difference between the two plates when they are separated by 5.0mm? AV :Ed 3. A cylinder of length l0.0cm and radius 3.0cm has a net electric flux of 2.0Nm2/C through it side, -6.0Nm2/C through the top and 2.0Nm2/C through the bottom, what is the sign and magnitude of the charge enclosed by the cylinder? Qacus‘ law (A; = €991” — 2-0Nm74/ fo 4. If the voltage at a point in space is zero, then the electric field must be, (please circle the best fitting response) A Negative B Positive C Zero V Uniform possible to determine based on the information given 5. Four charges are arranged in a square, what is the direction of the electric field at the center of the square? The top right charge is -2q, the 10p left +q,-the bottom right +q and bottom left +3q. 4-K -—2¢L. fl . «a. 6. What unit is used to eXpress electric potential energy? flat/lilo) 7. Why will a charged particle‘s Velocity increase as work is done on it by an electric field? Larval/vat?“ 0* “WW 8. A circular disc of radius i0.0cr‘n is placed in a uniform electric field of 2.0N/C. It is aligned so that the angle between normal to the disk and the electric field is 50°. What is the electric flux through the disk? . /1\ (DE 7- AECOSQ / rcr’i 9. Consider the following expression, what does 2L denote? iO. Correct the following statement Electric field lines show the direction a positive test charge will Mn. ewe/Mn Le Fe 1 1 .Three charges are placed on an equilateral triangle of sides 5.0cm, with one charge at each corner. On each of the bottom corners there is a +2.0nC Charge. What is the magnitude and direction of the electrostatic force on a -i ._0nC charge positioned at the Upper corner? “ Two marks“ i2.Two positions are separated by distances of 2.0cm and 4.0cm from a point charge. If the potential difference between the two positions is iOOV what is the charge? Two marks -rza, ,_ _, AV-“fi’”p1 r1 13.Two point charges are arranged on an x—axis. The first charge is located at 0.0cm and has a value of +q. the second charge is located at 12.0cm and has a value of +2q. At what point on the x-axis is the electric field zero? Two marks 1.4.The electric field strength inside a capacitor is 2.0x] 05N/C, if the plates each have an area of 10cm2, what is the magnitude of the charge on one plate? Two marks ,.—-—-———.___ . 1‘0 UZQ/A c“ E a, 15.A glass bead of charge 2.0nC with mass 1.0g is moving with speed 2m/s when it is far from a point charge of 5.0nC, what is the bead's speed when it is 1.0mm distant from the point charge? Two marks [-Oimm 1. I '7— Kara/L imif 7' Emu/p + r’ 501% for U?»— ml-QQ W: ...
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physics exam1 - Introductory Physics 029:082 Dr Bryce EXAM...

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