Assignment College Physics Quiz

COLLEGE PHYSICS QUIZ 1
COLLEGE PHYSICS QUIZ
By Name
Course
Instructor
Institution
Location
Date

COLLEGE PHYSICS QUIZ 2
COLLEGE PHYSICS QUIZ
The advantage of using many turns in Faraday’s experiment is that the since the induced current
and the EMF are proportional to number of turns N, then increasing the number of turns makes it
easier to experimentally measure EMF and the induced current.
Emf =−N ∆∅
∆ t
Where ∅ = Magnetic Flux = BA
N = No of turns
A = Area of coil
B = External magnetic field
Many turns in the secondary turns generates a larger current and voltage output and many turns
in the primary coil produce larger magnetic flux.
(Shifrin, et al., 2012)
Magnetic Field is defined as the region around the magnet where the charge moving experiences
a force. It is a vector field that illustrates the magnetic effect on electrical charges in magnetized
materials or relative motion. The magnetic field effects are generally observed in repulsion or
attraction of permanent magnets with other magnets.
Magnetic Flux is the product of the perpendicular area that magnetic field penetrates and the
average magnetic field and is defined as the strength or quantity of magnetic lines generated by
magnet.

COLLEGE PHYSICS QUIZ 3
a) When the South Pole of the magnet is thrust toward the center of the circular ring, a current
is induced. The current and EMF are induced in the ring because of the changing magnetic
flux. As the magnet gets closer to the circular ring, more lines of magnetic field are going
through the circular ring. Using the Right-Hand rule and Lenz’s law, the induced current
direction when the South Pole is brought towards the circular ring is clockwise.
The current induced in the loop opposes the change in flux and attempts to produce magnetic
field line through the loop pointing away from me. The current induced in a clockwise direction
provides the magnetic field opposing (Bussey, 2015).
b) When the magnet is held steady, current is not induced in the circular ring. The current and
induced EMF are not induced since there is no change in the magnetic flux through the
circular ring when the magnet is steadily held.
c) When the magnet is withdrawn, the current is induced. The current and EMF are induced in
the circular ring because of changing magnetic flux. When pulling the magnet out of the
circular ring towards you, however, fewer lines of magnetic field are passing through the
circular ring. Using Right-Hand rule and Lenz’s law the induced current direction when
magnet is pulled out from the circular ring is counterclockwise.

COLLEGE PHYSICS QUIZ 4
In this instance, the number of lines of magnetic field pointing towards you and coming through
the loop is reducing. The current induced in the loop opposes the flux change and creates more
lines of magnetic field through the loop pointing towards you. The current induced clockwise
provided the magnetic field opposing (Coufal, 2017).
a) When the wire loop is pulled away from the wire carrying current, the magnetic field
through the loop as a result of wire carrying current is into the page. When pulling the
wire loop, there is decrease in flux since the magnetic field in proportional inversely to
the wire distance. The current induced to increase the magnetic field inward, which
means that the current induced is in clockwise direction (Behroozi, 2019).
b) In case the wire loop stays fixed but the current reduces, then the magnetic field inward
through the loop will be decreasing again hence the current induced is in clockwise
direction.

COLLEGE PHYSICS QUIZ 5
a) Since both the flat magnet and loop are on the table, all the field lines are parallel to the
face of the loop since there is no lines of magnetic field piercing the loop from the bottom
to the top or from the top to the bottom. Therefore, no current induced, no change in
magnetic flux, and no magnetic flux in the loop.
b) In case the magnet is thicker compared to the loop, there will be presence of magnetic
field lines piercing the loop from bottom to top or from top to bottom. The magnetic flux
increases as the magnet gets nearer to the loop, hence current is induced resulting in the
field lines pointing upward through the loop. The current flows in counterclockwise
direction (Kutkovetskyy, 2014).
a) Yes, the current will be induced in the second loop. Since the battery is coupled to the
front loop and the current begins flowing, it will generate an increased magnetic that is
pointing down through the two loops and away from you. The current and EMF will be
induced in the second loop since the magnetic flux will be increasing in the second loop.
b) The current induced in the second loop begins flowing immediately the front loop current
begins increasing and creating a magnetic field.
c) The second loop current stops flowing immediately the front loop current becomes
steady. Once the current has been increased by the battery in the front loop to its steady-

COLLEGE PHYSICS QUIZ 6
state value from zero, created magnetic field is also steady. The current induced goes to
zero since the magnetic flux through the second loop is no longer varying (Kyung &
Taehun, 2020).
d) The current induced in the second loop is counterclockwise. Since the increasing front
loop current flowing in clockwise direction is resulting in an increasing magnetic field
line numbers down through the second loop, Lenz’s law indicates that the second loop
attempts opposing the flux change. By opposing this flux change, the right-hand rule
states that the current counterclockwise will be induced in the second loop.
e) Yes, there is force between the two loops. Since both the loops create magnetic fields and
carry currents while the front loop current is increasing due to the battery, the magnetic
field caused by the other loop will be felt by each current (Kyung & Taehun, 2020).
f) The force between the two loops repels one another. The magnetic field is created by the
front loop pointed toward the second loop. The current is induced in the second loop by
the varying magnetic field to oppose the magnetic field increasing, and this current
induced produces magnetic field facing towards the front loop. These two magnetic fields
operate like two north poles facing at one another hence repelling.
Yes, the current will be induced in the second loop. The current will be start to be induced in the
second loop immediately after disconnecting of the battery from the first coil and stop when the
current reduces to zero in the first coil. The second loop current will be clockwise direction.

COLLEGE PHYSICS QUIZ 7
a) The current induced in RA is to the right as coil B is moved towards coil A. As A is
approached with B, there is an increase in the magnetic flux through coil A. The EMF
induced in coil A produces a current to generate a magnetic field that opposes this flux
increase, with the field facing to the right through the coil center. A current to the right
through RA generates this opposing field (Kutkovetskyy, 2014).
b) The current induced in RA is to the left as coil B is pushed away from coil A. As B
retreats from A, there is a decrease in the magnetic flux through coil A. The EMF
induced in coil A produces a current to generate a magnetic field that opposes this flux
decrease. A current to the left through RA will generate this opposing fields.
c) The current induced in RA is to the left as RB in coil B is increased. The coil B current
decreases as RB increases, which also reduces the magnetic field produced by coil B. As
coil B magnetic flux reduces, the coil A magnetic flux reduces. The EMF induced in coil
A produces a current to generate a magnetic field pointing to the left through the coil

COLLEGE PHYSICS QUIZ 8
center, opposing the flux decrease. A current to the left through RA generate this opposing
field (Coufal, 2017).
PROBLEM
The induced EMF, E E=−N ∆∅
∆ t
Where, E = Induced EMF = ?
E=−2 38 Wb− (−58 Wb )
0.34 s =−564.71 V
¿ E/¿564.71V
Right to the Left. Lenz’s law indicated that the direction of current induced in a coil is such that
the coil magnetized opposes motion of the external magnet causing it. With the use of index
finger, the current flows from the right to the left through the resistor. The electric current is
generated in the coil through the magnetic flux (Kyung & Taehun, 2020).