Unformatted text preview: Physics 202] Exam I
February 5, 2009
I. For multiple choice questions, circle the letter in bout of the on correct respo se to the question. 5 points each. Three point charges are located on the x axis. The ﬁrst charge, q1— = 10 [AC 15 at x— — 1. 00 m,
the second, qz— — 20 ac at the origin, and a third, q3 _ 30 C at x= +2. 00 111. Which charge 15
a d on by the force of greatest magnitude? {2 3L 1.} 65M $46 23530“ q: r 9 (647613 if” C ,Q,¢?%e g equal on q and q; : ... ",1;
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2. When the perpendicular distance ﬁ‘om a linear charge distribution 18 tripled, what happens to
the magnitude of the electric ﬁeld? —=> It decreases by a factor of 9 i
in a. It remains the same. P . E , 7 ,r
$ It decreases by a factor of 3 {1 5;}?1” 91f éor 3:10 V: g It decreases by a factor of (3) c. It increases by a factor of (3)“2 3. An electron is moving in an electric ﬁeld. The direction of the acceleratigpaof the electron is
a. 1n the direction the electron is moving. ‘
b. Opposite the direction the electron is moving. w
c. Perpendicular to the direction the electron is moving. 69
d. In the direction of the electric ﬁeld
a eOpposite the direction of the electric ﬁeld. 4. The equipotential surfaces associated with an isolated point charge are
a. radially outward from the charge ~ »
b. vertical planes ( * '
c. horizontal planes 1 ‘ . , i
a concentric spheres centered at the charge \ 7 ‘ r '
e. concentric cylinders with the charge on the axis
5. In a certain region of space the electric potential increases uniformly from east to west and
does not vary in any other direction, The electric ﬁeld
points north and does not vary with position. ’ M“ M “§
61> p0ints east and does not vary with position. ’i f K " "L
6. points west and does not vary with position. “"
d. points east and varies with position.
e. points west and varies with position.
1 Deﬁnitions and laws. Make your answers brief, but complete, and to the point. If you use an equation in an answer, you must deﬁne all terms. 10 points each. Formally, with proper mathematical and vector notation, state Gauss’ Law Deﬁne terms.
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 Spring '09
 JOHNMERIWEATHER
 Physics

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