PHYS222 CERTIFICATION GUIDE
FOR 2025/2026 TESTS|MOST COMMON
QUESTIONS WITH CORRECTLY VERIFIED ANSWERS
(LATEST QUIZZES) |ALREADY A+
GRADED|GUARANTEED PASS
Two point charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown
in the figure. Which of the arrows best represents the net electric field at point P due to these
two charges?
a. A
b. B
c. C
d. D
e. the field is equal to zero at point P
(image link: https://www.chegg.com/homework-help/questions-and-answers/two-charges-q1-
q2-equal-magnitudes-opposite-signs-positioned-shown-fig-21-7-shown-arrows-r-q2667835 ) -
a. A
A system of four capacitors is connected across a 90-V voltage source as shown in the figure.
What is the equivalent capacitance of this system?
A)15 μF
B)3.3 μF
C)3.6 μF
D)1.5 μF
,(image link: https://www.chegg.com/homework-help/questions-and-answers/system-four-
capacitors-connected-across-90-v-voltage-source-shown-figure-charge-40-uf-capa-q7031229 ) -
B)3.3 μF
Three particles travel through a region of space where the magnetic field is out of the page, as
shown in the figure. What are the signs of the charges of these three particles?
A) 1 is neutral, 2 is negative, and 3 is positive.
B) 1 is neutral, 2 is positive, and 3 is negative.
C) 1 is negative, 2 is neutral, and 3 is positive.
D) 1 is positive, 2 is negative, and 3 is neutral.
E) 1 is positive, 2 is neutral, and 3 is negative. - C) 1 is negative, 2 is neutral, and 3 is
positive.
In the circuit, two capacitors and a resistor in series are connected to a battery. Initially the
switch is open. What is the current through the resistor a long time after the switch has been
closed?
A) 1.25 * 10^-5 A
B) 1 A
C) 4 A
D) 0 - D) 0
A 5 m long straight wire carries a current of 5 A directed north (ignore the rest of the circuit).
The magnitude of the force on this section of wire in a region where a uniform 5 T magnetic
field points south is
A) 1 N
B) 125 N
C) 25 N
,D) 0 - D) 0
Two electrons are 20.0 mm apart at closest approach. What is the magnitude of the maximum
electric force that they exert on each other? (e = 1.60 × 10-19 C, k = 1/4πε0 = 9.0 109 N ·
m2/C2)
A) 5.8 × 10^-27 N
B) 5.8 × 10^-25 N
C) 2.3 N
D) 2.3 × 10^10 N - B) 5.8 × 10^-25 N
A conducting sphere contains positive charge distributed uniformly over its surface. Which
statements about the potential due to this sphere are true? All potentials are measured relative
to infinity. (There may be more than one correct choice.)
A) The potential at the center of the sphere is the same as the potential at the surface.
B) The potential at the center of the sphere is zero.
C) The potential is lowest, but not zero, at the center of the sphere.
D) The potential at the surface is higher than the potential at the center.
E) The potential at the center is the same as the potential at infinity. - A) The potential at
the center of the sphere is the same as the potential at the surface.
What is the current through the battery in the circuit shown below?
(Square series circuit with 8V battery, 4Ω resistor directly across, and 4Ω resistor in between
them on the left side, the right side is empty)
A) 1 A
B) 4 A
C) 2 A
D) 8 A - V = IR
, 8V = I (4+4 = 8Ω)
A) 1 A
Determine the current in the 7.0-Ω resistor for the circuit shown in the figure. Assume that the
batteries are ideal and that all numbers are accurate to two significant figures.
A) 0.28 A
B) 1.6 A
C) 2.1 A
D) 1.3 A - B) 1.6 A
Suppose a region of space has a uniform electric field, directed towards the right, as shown in
the figure. Which statement about the electric potential is true?
A)The potential at points A and B are equal, and the potential at point C is lower than the
potential at point A.
B)The potential at point A is the highest, the potential at point B is the second highest, and the
potential at point C is the lowest.
C)The potential at points A and B are equal, and the potential at point C is higher than the
potential at point A.
D)The potential at all three locations (A, B, C) is the same because the field is uniform.
(image link: https://www.chegg.com/homework-help/questions-and-answers/10-suppose-
region-space-uniform-electric-field-directed-towards-right-shown-figure-stateme-q24172936 ) -
A)The potential at points A and B are equal, and the potential at point C is lower than the
potential at point A.
Two parallel long wires each have a large current I flowing out of the page, as shown. In what
direction does the magnetic field point at position P?
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FOR 2025/2026 TESTS|MOST COMMON
QUESTIONS WITH CORRECTLY VERIFIED ANSWERS
(LATEST QUIZZES) |ALREADY A+
GRADED|GUARANTEED PASS
Two point charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown
in the figure. Which of the arrows best represents the net electric field at point P due to these
two charges?
a. A
b. B
c. C
d. D
e. the field is equal to zero at point P
(image link: https://www.chegg.com/homework-help/questions-and-answers/two-charges-q1-
q2-equal-magnitudes-opposite-signs-positioned-shown-fig-21-7-shown-arrows-r-q2667835 ) -
a. A
A system of four capacitors is connected across a 90-V voltage source as shown in the figure.
What is the equivalent capacitance of this system?
A)15 μF
B)3.3 μF
C)3.6 μF
D)1.5 μF
,(image link: https://www.chegg.com/homework-help/questions-and-answers/system-four-
capacitors-connected-across-90-v-voltage-source-shown-figure-charge-40-uf-capa-q7031229 ) -
B)3.3 μF
Three particles travel through a region of space where the magnetic field is out of the page, as
shown in the figure. What are the signs of the charges of these three particles?
A) 1 is neutral, 2 is negative, and 3 is positive.
B) 1 is neutral, 2 is positive, and 3 is negative.
C) 1 is negative, 2 is neutral, and 3 is positive.
D) 1 is positive, 2 is negative, and 3 is neutral.
E) 1 is positive, 2 is neutral, and 3 is negative. - C) 1 is negative, 2 is neutral, and 3 is
positive.
In the circuit, two capacitors and a resistor in series are connected to a battery. Initially the
switch is open. What is the current through the resistor a long time after the switch has been
closed?
A) 1.25 * 10^-5 A
B) 1 A
C) 4 A
D) 0 - D) 0
A 5 m long straight wire carries a current of 5 A directed north (ignore the rest of the circuit).
The magnitude of the force on this section of wire in a region where a uniform 5 T magnetic
field points south is
A) 1 N
B) 125 N
C) 25 N
,D) 0 - D) 0
Two electrons are 20.0 mm apart at closest approach. What is the magnitude of the maximum
electric force that they exert on each other? (e = 1.60 × 10-19 C, k = 1/4πε0 = 9.0 109 N ·
m2/C2)
A) 5.8 × 10^-27 N
B) 5.8 × 10^-25 N
C) 2.3 N
D) 2.3 × 10^10 N - B) 5.8 × 10^-25 N
A conducting sphere contains positive charge distributed uniformly over its surface. Which
statements about the potential due to this sphere are true? All potentials are measured relative
to infinity. (There may be more than one correct choice.)
A) The potential at the center of the sphere is the same as the potential at the surface.
B) The potential at the center of the sphere is zero.
C) The potential is lowest, but not zero, at the center of the sphere.
D) The potential at the surface is higher than the potential at the center.
E) The potential at the center is the same as the potential at infinity. - A) The potential at
the center of the sphere is the same as the potential at the surface.
What is the current through the battery in the circuit shown below?
(Square series circuit with 8V battery, 4Ω resistor directly across, and 4Ω resistor in between
them on the left side, the right side is empty)
A) 1 A
B) 4 A
C) 2 A
D) 8 A - V = IR
, 8V = I (4+4 = 8Ω)
A) 1 A
Determine the current in the 7.0-Ω resistor for the circuit shown in the figure. Assume that the
batteries are ideal and that all numbers are accurate to two significant figures.
A) 0.28 A
B) 1.6 A
C) 2.1 A
D) 1.3 A - B) 1.6 A
Suppose a region of space has a uniform electric field, directed towards the right, as shown in
the figure. Which statement about the electric potential is true?
A)The potential at points A and B are equal, and the potential at point C is lower than the
potential at point A.
B)The potential at point A is the highest, the potential at point B is the second highest, and the
potential at point C is the lowest.
C)The potential at points A and B are equal, and the potential at point C is higher than the
potential at point A.
D)The potential at all three locations (A, B, C) is the same because the field is uniform.
(image link: https://www.chegg.com/homework-help/questions-and-answers/10-suppose-
region-space-uniform-electric-field-directed-towards-right-shown-figure-stateme-q24172936 ) -
A)The potential at points A and B are equal, and the potential at point C is lower than the
potential at point A.
Two parallel long wires each have a large current I flowing out of the page, as shown. In what
direction does the magnetic field point at position P?
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