PES 1120 General Physics II
Practice Exam 1
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One (3” x 5”) index card may be used for formulas or other notes or diagrams.
Definitions & Concepts (2 pts each)
1. (2 pts) Which of the following illustrates electric field lines between two point charges of
equal but opposite charge (dipole)?
2. What units will result from the multiplication of electric field units times charge units?
a. Newtons per coulomb
b. Coulombs per second
c. Newtons
d. Coulombs
Applications (4-6 pts each)
3. If a = 3.0 mm, b = 4.0 mm, Q1 = –60 nC, Q2 = 80 nC, and q = 30 nC in the figure, what is the
magnitude of the total electric force on q?
4. If a = 60 cm, b = 80 cm, Q = –6.0 nC, and q = 6.0 nC, what is the electric field vector at point
P in the figure?
R. Gist
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Long Semester Ver. D, Rev 2
PES 1120 General Physics II
Practice Exam 1
5. An electron enters a region of uniform electric field (E = 50 N/C) with an initial velocity of 40
km/s directed the same as the electric field. What is the speed of the electron 1.5 ns after
entering this region?
6. The total electric flux through a closed cylindrical (length = 1.2 m, diameter = 0.20 m) surface
is equal to -5.0 N  m2/C. Determine the net charge within the cylinder.
7. A uniform electric field of strength 10 N/C is pointing in the direction defined by
u=0.8j + 0.6k. What is the electric flux due to this field that passes through a square of side
length 1 cm that is lying in the x-y plane? (Assume the face of the square in the +z direction to
be the front.)
8. An ion has a net charge of -6.41 x 10-19 C. What is the difference between the number of
protons and electrons for this ion? Are there more electrons or more protons? (Fundamental
quantum of charge is e = 1.602 x 10-19 C.)
9. Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A point charge
of 5.0 nC is fixed at z = 1.0 m. Determine the magnitude of the electric field at the point b,
which is exactly halfway between the plane and the point charge.
Types of charged objects that may be used on this exam:
Point charge, Infinite line charge, Infinite plane charge, Charged ring
R. Gist
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Long Semester Ver. D, Rev 2