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Practice Midterm Exam 1 As soon as you begin your proctored session, hold up your government issued ID so that both the card and your face are clearly visible on screen. Hold the card for a minimum...

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Practice Midterm Exam 1
As soon as you begin your proctored session, hold up your government issued ID so that both
the card and your face are clearly visible on screen. Hold the card for a minimum of five full
seconds before beginning the quiz.
If you have any issues with your webcam during the assessment, continue working, then
contact Webcourses@UCF Support (http:
online.ucf.edu/support/) .
After completing the assessment, you may turn off your webcam.
For questions or assistance, please contact Webcourses@UCF Support XXXXXXXXXXo
XXXXXXXXXX (mailto: XXXXXXXXXX)

15 ptsQuestion 1
What is the force on the q =-1nC point charge, if q =-2nC, and distance d is 0.1m.
Provide your answer in 10 N (for instance if the right answer is 0.00025N o
2.5x10 N, you will need to introduce "2.5" in the answer box). k=9.0x10 Nm /C

1 2
-4
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4 ptsQuestion 2
Stop Webcam
Show Webcam
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The strogest electric field is at the mid point between the particles
The charge on P is smaller than the charge on Q
The electrostatic force on P is smaller than the force on Q
Both particles are negatively charged

The figure shows electric field lines arising from two small charged particles
P and Q.

15 ptsQuestion 3
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What is the electric potential at the dot due to charges q1=-1nC, q2=9nC, and
q3=4nC, The distance a is 0.03m, while the distance b is 0.09m. Please provide
your answer in units of V.

4 ptsQuestion 4
A region of space contains a uniform electric field, directed toward the right,
as shown in the figure. Which statement about this situation is co
ect?
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The potentials at points A and B are equal, and the potential at point C is higher than the
potential at point A.
The potential at points A and B are equal, and the potential at point C is lower than the
potential at point A.
The potential at all three locations is the same
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

4 ptsQuestion 5
trThe elecic field is zero at the surface
The electric field is constant at the surface
The electric potential is constant over the surface
The electric potential of the surface is zero
Which statements must be true about the surface of a charged conductor in which
no charge is moving?

4 ptsQuestion 6
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A
C
B
D

Three equal charges +Q are at three of the corners of a square of side d. A fourth
charge +Q of equal magnitude is at the center of the square as shown in the figure
Which one of the a
ows shown represents the net force acting on the charge at
the center of the square?

15 ptsQuestion 7
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Two particles with charge +q and -q of 71nc are positioned as shown in the figure.
The distance d is 0.31m.
What is the strength of the electric field at the point indicated by the dot (in units of
N/C)? k=9.0x10 Nm /C9 2 2

4 ptsQuestion 8
spheres #1 and #2 are still uncharged
spheres #1 and #2 both ca
y negative charge.
sphere #1 ca
ies positive charge and #2 ca
ies negative charge.
sphere #1 ca
ies negative charge and #2 ca
ies positive charge.
Two uncharged metal spheres, #1 and #2, are mounted on insulating support
ods. A third metal sphere, ca
ying a positive charge, is then placed near #2.
Now a copper wire is momentarily connected between #1 and #2 and then
emoved. Finally, sphere #3 is removed. In this final state
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4 ptsQuestion 9
The dipole rotates counterclockwise
The dipole remains motionless
The dipole rotates clockwise
The dipole moves to the left
The dipole moves to the right.

A dipole is held motionless in a uniform electric field. When the dipole is
eleased, which of the following describes the subsequent motion?

4 ptsQuestion 10
impossible to determine based on the information given
negative
zero
If the electric potential at a point in space is zero, then the electric field at that point
must be
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positive
uniform

4 ptsQuestion 11
3
1/2
1
1/3
2

The Figure shows two points inside a capacitor. The potential at the negative plate
is 0V. What is the ration V /V of the electric potentials at these two points inside
the capacitor?
1 2

4 ptsQuestion 12
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A and B have the same acceleration
B
A
The acceleration for A and B are zero

Two protons, A and B, are in an electric field. Which proton has the smallest
acceleration?

4 ptsQuestion 13
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4q
q and 2q are tied
q and 4q are tied
q
2q

Which of the three right-hand charges experiences the largest force?

4 ptsQuestion 14
It increases by a factor of 16
It increases by a factor of 8
It increases by a factor of 2
It increases by a factor of 4
Two point charges, Q and Q , are separated by a distance R. If the
magnitudes of both charges are halved and their separation is also halved,
what happens to the electrical force that each charge exerts on the othe
one?
1 2
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No new data to save. Last checked at 10:36pm
It remains the same

15 ptsQuestion 15
What is the magnitude of the vertical electric field that will balance the weight of a
plastic sphere of mass 2.0g that has been charged to -3.0 nC? Provide you
answer in 10 N/C. (for instance if the right answer is 1.1X10 N/C, you will need
to introduce "1.1" in the answer box). k=9.0x10 Nm /C
6 6
9 2 2
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Midterm exam 2

Find the intensity of the cu
ent in Amperes through the resistor R . R =4ohm,
R =1ohm, R =3ohm, and emf=4V.
B a
c

10 ptsQuestion 2

Find the cu
ent in Amperes through the resistor R=2 ohm if emf =8V and
emf =7V.
1
2
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4 ptsQuestion 3
increases
decreases
ncreases for a time and then starts to decrease
does not change
As more resistors are added in parallel to a constant voltage source, the
power supplied by the source


4 ptsQuestion 4
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A, C, B
A, B, C
C, B, A
B, A, C
Identical light bulbs can be attached to identical ideal batteries in three
different ways (A, B, or C), as shown in the figure. The ranking (from highest
to lowest) of the total power produced by the battery is

4 ptsQuestion 5
The equivalent resistance is less than that of the largest resistor.
The equivalent resistance is more than the largest resistance.
Four unequal resistors are connected in series with each other. Which one of
the following statements is co
ect about this combination?
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The equivalent resistance is equal to that of any one of the resistors.
The equivalent resistance is equal to average of the four resistances.

4 ptsQuestion 6
B
D
A
C
Chose the circuit in which is described by the following:
Two batteries, a resistor between them, and a capacitor in parallel with the
esistor. The batteries are connected negative pole to positive pole.


4 ptsQuestion 7
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the power generated in each resistor is the same
the potential drop is always the same across each resisto
the same cu
ent always runs through each resisto
the largest resistance has the largest cu
ent through it
When unequal resistors are connected in parallel in a circuit:

20 ptsQuestion 8
Find the the potential drop across R . R =10ohm, R =4ohm, R =3ohm, R =9ohm,
and emf=9V.
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15 ptsQuestion 9
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How much charge is transfe
ed from the battery to the capacitors as the
capacitors charge? C =1x10 F, C =7x10 F, C =8x10 F, and emf=2.
Provide your answer in micro C (for instance if the right answer is "5.5micro C" o
"5.5x10 C", you will need to introduce "5.5" in the answer box).
1
-6
2
-6
3
-6
-6

4 ptsQuestion 10
The 1Ω resisto
The 9Ω resisto
They dissipate the same powe

Which resistor dissipates less power?
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4 ptsQuestion 11
increases
does not change
decreases
As more resistors are added in series to a constant voltage source, the
power supplied by the source


4 ptsQuestion 12

What does the voltmeter read?

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Nothing because this will fry the meter.
3 ohm
6V
3V
2V

4 ptsQuestion 13
twice as large as before
the same as before
one-half as large as before
three times as large as before
A capacitor C is connected in series with a resistor R across a battery and an open
switch. If a second capacitor of capacitance 2C is connected in parallel with the
first one, the time constant of the new RC circuit will be
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Quiz: Practice Exam - Midterm Exam 3
11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3
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Practice Exam - Midterm Exam 3
Started: Nov 13 at 2:53pm
Quiz Instructions
For the exam you must:


4 ptsQuestion 1
Path c
Path a
non of the paths provided
A negatively charged particle is moving to the right, as shown in the figure.
Suddenly it encounters uniform magnetic field pointing out of the page. Which one
of the three paths shown will it follow in the field?
e
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Path

4 ptsQuestion 2
There is no cu
ent, because no power supply is connected
ight to left
left to right
out of the page
into the page
A 1 kg horizontal aluminum bar, 0.1 m long, is pushed by a force F between two
vertical metal rods that are 0.1 m apart. A 0.1T magnetic field is directed
perpendicular to the plane of the rods as indicated. A 5 Ω resistor is connected
across the two rods at the bottom. What is the direction of the cu
ent through the
aluminum bar?
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10 ptsQuestion 3
An aluminum bar moves with a speed 6m/s between two copper roads in a
magnetic field of 5T as indicated on the figure. The distance between the coope
oads is 7m. The aluminum bar is always in contact with cooper roads and moves
without friction. A voltmeter is coupled between the roads. What is the potential
measured by the voltmeter (in volt), if the resistance of the rods and aluminum ba
are consider to be negligible?


10 ptsQuestion 4
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An aluminum bar moves with a speed 2.46m/s between two copper roads in a
magnetic field of 0.2T as indicated on the figure. The distance between the coope
oads is 0.5m. The aluminum bar is always in contact with cooper roads and
moves without friction. A resistor with a resistance of 4ohm is coupled between the
oads. Consider that the resistance of the copper rods and aluminum bar are zero
ohms? What is the power dissipated by the resistor in Watt? (if the right answer is
4.4x10 W, you will need to input 0.0044)

-3

15 ptsQuestion 5
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11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3
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Two vertical copper wires ca
y a cu
ent I =4A while two horizontal cooper wires
ca
y a cu
ent I =74A as indicated on the drawing. Calculate the magnitude of the
magnetic field in Tesla at the blue dot, which is positioned at distance d1=2.90m
from the vertical wires and distance d2=6.0m from the vertical wires. Provide you
answer in 10 T (for instance if your answer is 2.45*10 T, you will need to input
2.45 in the answer box)

1
2
-6 -6

15 ptsQuestion 6
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Calculate the total magnetic force on Wire 2, if I=39A, d=7.2m and the length of all
wires is 1m. Please provide your answer in Newtons (if the right answer is
"1.5x10 N" you need to input "1500" or if the right answer is "2.5x10 N" you need
to input "0.025")
3 -2

4 ptsQuestion 7
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The distance between
Answered 3 days After Dec 01, 2022

Solution

Baljit answered on Dec 05 2022
39 Votes
1.A
2.D
3.B
4.E
5.B
6.C
7.C
8.C
9.B
10.D
11.A
12A
13D
14A
15 C
16c
17B
18D
19D
20C
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