PHYS222 Exam 1 2024/2025 with 100% correct answers
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Course
PHYS222
Institution
PHYS222
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:
A system ...
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 ) correct answersa. 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?
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. correct answersC) 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 correct answersD) 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 correct answersD) 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 correct answersB) 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. correct answersA) 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 correct answersV = 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 correct answersB) 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 ) correct answersA)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?
---I-------------P---I----
A)up
B)right
C)down
D)left correct answersC)down
The three-point charges shown in the figure form an equilateral triangle with sides 4.9 cm long. What is
the electric potential (relative to infinity) at the point indicated with the dot, which is equidistant from all
three charges? Assume that the numbers in the figure are all accurate to two significant figures.
(k = 1/4πε0 = 9.0 × 10^9 N · m^2/C^2)
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