Physics 102
Spring 2008
Take-home Quiz 3 Chapter 17 & 18
Please circle the correct answer
1) One joule per coulomb is a
A) newton.
B) volt.
C) electron-volt.
D) farad.
2) Two identical aluminum objects are insulated from their surroundings. Object A has a net
charge of excess electrons. Object B is grounded. Which object is at a higher potential?
A) A
B) B
C) Both are at the same potential.
D) cannot be determined without more information
3) For a proton moving in the direction of the electric field
A) its potential energy increases and its electric potential decreases.
B) its potential energy decreases and its electric potential increases.
C) its potential energy increases and its electric potential increases.
D) its potential energy decreases and its electric potential decreases.
5) A small charged ball is accelerated from rest to a speed v by a 500 V potential difference. If
the ball is now accelerated from rest by a potential difference of 2000 V, what will the new speed
of the ball be?
A) v
B) 2v
C) 4v
D) 16v
6) A surface on which all points are at the same potential is referred to as
A) a constant electric force surface.
B) a constant electric field surface.
C) an equipotential surface.
D) an equivoltage surface.
7) The electron-volt is a unit of
A) voltage.
B) current.
C) power.
D) energy.
8) The absolute potential at the center of a square is 3.0 V when a charge of +Q is located at one
of the square's corners. What is the absolute potential at the square's center when a second charge
of -Q is placed at one of the remaining corners?
A) zero
B) 3.0 V
C) 6.0 V
D) 9.0 V
9) A parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the
distance between the plates is halved, what is the new capacitance?
A) C/4
B) C/2
C) 2C
D) 4C
10) The total amount of charge that passes through a wire's full cross section at any point per unit
of time is referred to as
A) current.
B) electric potential.
C) voltage.
D) wattage.
11) What is 1 Ω equivalent to?
A) 1 J/s
B) 1 W/A
C) 1 V ∙ A
D) 1 V/A
Please calculate the following problems, showing your work, and circle the correct
answer. To receive full credit, you must show your work.
12) A proton, initially at rest, is accelerated through an electric potential difference of 500 V.
What is the kinetic energy of the proton?
A) 500 J
B) 8.0 × 10-17 J
C) 1.6 × 10-19 J
D) zero
13) A proton, initially at rest, is accelerated through an electric potential difference of 500 V.
What is the speed of the proton?
A) 2.2 × 105 m/s
B) 3.1 × 105 m/s
C) 9.6 × 1010 m/s
D) zero
14) A 4.0-g object carries a charge of 20 μC. The object is accelerated from rest through a
potential difference, and afterward the ball is moving at 2.0 m/s. What is the magnitude of the
potential difference?
A) 800 kV
B) 400 kV
C) 800 V
D) 400 V
15) Consider a uniform electric field of 50 N/C directed toward the east. If the voltage measured
relative to ground at a given point is 80 V, what is the voltage at a point 1.0 m directly west of
that point?
A) 30 V
B) 50 V
C) 80 V
D) 130 V
16) A coffee maker, which draws 13.5 A of current, has been left on for 10 min. What is the net
number of electrons that have passed through the coffee maker?
A) 1.5 × 1022
B) 5.1 × 1022
C) 1.8 × 103
D) 8.1 × 103
17) A light bulb operating at 110 V draws 1.40 A of current. What is its resistance?
A) 12.7 Ω
B) 78.6 Ω
C) 109 Ω
D) 154 Ω
18) A 12-V battery is connected to a 100-Ω resistor. How many electrons flow through the wire
in 1.0 min?
A) 1.5 × 1019
B) 2.5 × 1019
C) 3.5 × 1019
D) 4.5 × 1019