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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  lO2
Milli m 10*3
Micro u 106
Nano n 109 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 = 1.6xlOl9C
k = 8.99 x lOS’NmZIC2
so = 8.85xl 0'12C2/ [Nm2)
N0 = 6.031023 pariicles/mal
Mp = l.67xlO27kg 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”
— 20Nm74/ 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. 4K —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
xaxis 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?»— mlQQ W: ...
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 Spring '08
 Akgun
 Physics

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