Physics Task: Magnets DC motors, Electromagnetic induction-Task and Questions

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PART 1
The diagram under pomps the cross-sections of brace wire regulators M and N, twain
standing-upsuitable to the page and twain carrying correspondent floatings into the page. In these questions
ignore any donation from the Earth?s magnetic arena. The arrows A-D and lore E-G
represent options from which you are to elect in echoing questions 1, 2 and 3.
A
P
M
Q
Conductors
N
D
E extinguished of the page
F into page
G nothing arena
B
C
1.
What is the command of the magnetic arena ascribable to the brace floatings at subject-matter P?
Acceptance authority diagram interpretation
(2
marks)
2.
What is the command of the magnetic arena ascribable to the brace floatings at subject-matter Q?
Acceptance authority diagram interpretation
(2
marks)
3.
The floating in regulator N is reversed so that the floating is copious extinguished of the page.
What is the command of the magnetic arena ascribable to the brace floatings at subject-matter P now?
Acceptance authority diagram interpretation
(2
marks)
4.
A wire MN trials a authority which acts down betwixt the jaws of a horseshoe
magnet (look under). Floating glides in the wire from M to N.
Downward
force
Current
Flow
Which is the north pole of the magnet (X or Y), and which is the south pole of the
magnet (X or Y) to agent this downward authority?
Answers single decree interpretation
(2 tracks)
North Pole =
South Pole =
Questions 5-8 apply to the subjoined counsel.
A DC motor consisting of a span of magnets and a rotor implication is pompn under at t = 0 seconds.
Note: appropriate that there is acommutator strong to the rotor?s implication.
The magnets fruit a regular magnetic arena of 0.80T. The rotor implication consists of 20 metamorphoses of
wire, each of which are balances of interest elongation 4cm. The rotor implication is rotating with a abundance
of 5.0Hz, and has a floating of 1.5A copious through it.
5.
Calculate the concretion of the magnetic authority acting at t = 0 seconds on
(a) interest AB of the implication
(b) interest BC of the implication
Formula anticipations
(2 tracks)
ForceAB =
N
ForceBC =
N
6.
Which single of the subjoined describes the primal reversion of the implication in the emblem
above:
A. clockwise B. anti-clockwise C. it doesn?t move D. cannot be determined
Acceptance interpretation
(2 tracks)
7.
At which span(s) conciliate the rotor implication trial culmination torque? (1 or further acceptances)
At = 0s Bt = 0.05s Ct = 0.10s Dt = 0.15s E t = 0.2s
Acceptance interpretation
(2 tracks)
8.
Describe what would fample if there is no commutator strong to the implication.
Interpretation required
(1 track)
9.Which of the subjoined actions best describes the footing in which the implication is agentd to
move faster?
A increasing the floating
B increasing the magnetic arena coercionce
C increasing the cross-sectional area of the implication
D ample of the aggravate.
Acceptance interpretation
(2 tracks)
Questions 10-12 apply to the subjoined counsel.
An electromagnet consists of a implication of wire dispread environing a soft-iron heart. An electric
floating is then passed through the wire. A novice conservations a magnetic environ to dare the
command of the magnetic arena environing the electromagnet. Appropriate that the magnetic arena of
the Earth can be ignored.
10.
Which purpose of the implication of wire is the North Pole: the left purpose or the just purpose?
Acceptance only
(1 track)
Conservation the acceptance interpretation aggravate just to sharp-end-quenched the command of the magnetic arena of the
electromagnet at each of the subjoined locations. If there is no magnetic arena transcribe nothing
11.
12.
At subject-matter C which is ininterest the implication of wire.
Acceptance only
2
(1 track)
W
m
At subject-matter B which is straightway under the implication of wire
Acceptance only
(1 track)
A floating-carrying wire is placed to the just of a floating-carrying solenoid (look under).
I2
I1
13.
W
m
Propound the command of the magnetic authority on the wire at P. Conservation the interpretation ardent under.
Answer
(1 track)
2
W
m
2
14.
A to the just
B to the left
C up the page
E into the page
F extinguished of the page
G no authority
D down the page
A emotional implication loudspeaker contains a implication of wire of 1000 metamorphoses, each of radius 5.0
cm, placed in a radial magnetic arena of 0.40T. The wire of the implication is at just angles to
the magnetic arena at ample spans.
When there is a floating of 0.25A in the wire what is the concretion of the authority on the
coil?
Formula working
(2 tracks)
N
15.
Brace atoms X and Y are roaming through a magnetic arena which is plained into
the page. Look under.
What is the carry on each atom X and Y: absolute or indirect? If none, transcribe ?no
charge?. Elucidate your acceptances.
W
m
2
1.
2.
PART 2
A round loop of wire of area 0.40 m2 is in a magnetic arena of 2.5 ? 10-2 T. What is the
magnetic transmutation through the loop if the roll of the loop is (a) standing-upsuitable (b) congruous to
the command of the magnetic arena?
Answers coercionmulas and anticipations
(2 tracks)
(a)
Wb
(b)
Wb
An emf of 1.5 millivolts is adventitious in a solenoid consisting of ten metamorphoses of wire when
the magnetic transmutation threading the solenoid extensions from nothing to a treaassuflushed of X in 1.5
milliseconds.
What is the concretion of X?
Conservation a coercionmula and anticipations to elucidate your acceptance
(2
marks)
Wb
A balance loop of wire of interest elongation 5.0 ? 10-2m moves at 50Hz betwixt the poles of a
large electromagnet. The coercionce of the magnetic arena of the electromagnet is 0.80 T.
3.
4.
How greatly transmutation cuts through the loop when the roll of the loop is (a) congruousand (b)
standing-upsuitable to the command of the magnetic arena?
Conservation a coercionmula and anticipations to elucidate your acceptance
(3 tracks)
(a)
Wb
(b)
Wb
Calculate the mediocre EMF adventitious as the loop metamorphoses 90? from the congruous standing
referring-to to the magnetic arena, to the standing-upsuitable standing applyring-to to the magnetic
field, as coercioncible in Question 3 aggravate?
Conservation a coercionmula and anticipations to elucidate your acceptance
(3 tracks)
V
5.
If the opsituation of the loop is 4.0?, what floating glides in the loop during this 90?
rotation?
Conservation a coercionmula and anticipations to elucidate your acceptance
(2 tracks)
A
The emblem under pomps the north pole of a suppress magnet nature pushed into a solenoid.
Coercion each of the footings in Questions 6, 7 and 8 propound whether the floating glides
through the galvanometer from X to Y, from Y to X, or neither.
6.
7.
The north pole is moved towards the solenoid.
Acceptance vector diagram.
marks)
The north pole of the magnet is undistinguishable from the solenoid.
Acceptance vector diagram.
(2
(2 tracks)
8.
The magnet is held quiescent in the solenoid.
Acceptance vector diagram or interpretation.
(2 tracks)
A physics novice pulls a aggravate loop of wire at a steady press through a regular
magnetic arena. The magnetic arena has a coercionce of 0.30 T and the loop itself is 4.0 cm
crave and 3.0 cm extensive.
9.
Calculate the magnetic transmutation threading the loop when it is alconcomitantly immersed in the
magnetic arena.
Conservation a coercionmula and anticipation to help your acceptance
(2 tracks)
10. The novice keeps pulling the loop with a steady press until it alconcomitantly exits the
magnetic arena.
Which of the graphs under best demonstrates the alteration of the magnetic transmutation through
the loop with span?
Acceptance interpretation
(2 tracks)
Wb
11. Portraiture under the transmutation-span graph you chose coercion Question 10. Using this graph portray a
graph of the (a) EMF adventitious aggravate the purposes of the loop and (b) the floating I in the
loop with honor to span. Hint: the adventitious voltage is ardent by the inplain climb of a
flux-span graph.
?
(3 tracks)
EMF
t
t
I
t
PART 3
To dare electromagnetic collection a novice conservations the equipment pompn under.
The novice moves the implication vertically extinguished of the arena at a steady press. The ample implication is
within the arena from t = 0 until t = 0.40s. It leaves the arena betwixt t = 0.40 s and t = 0.60 s.
The graph under pomps how the magnetic transmutation through the implication varies with span.
Magnetic
Flux
?
0
1.
M
a
g
n
e
t
i
0.2
c
F
l
u
following
x
0.4
0.6
0.8
Span (s)
Which of the
graphs on the present page best pomps the alteration with span of the
?
voltage aggravate the purposes of the implication? Transcribe your acceptance here with an interpretation.
Acceptance interpretation
(2 tracks)
The implication has 200 metamorphoses and the area of each metamorphose is 0.020 m2. The regular magnetic arena is
0.080 T.
2.
What is the mediocre voltage fruitd aggravate the purposes of the implication coercion the span gap from
t = 0.40s to t = 0.60s?
Enclose a coercionmula and anticipations in your acceptance
(2 tracks)
V
The implication is now moved counterclockwise at steady press abextinguished its axis of reversion, and the
alteration of voltage with span is pompn under.
V
2
2
1
1
X
Y
Axis of reversion
10
20
30
40
50
60
Span (ms)
5
3.
During the pristine half (180?) of the implication?s reversion, does the adventitious floating glide from X,
through the implication, to Y; or from Y, through the implication, to X?
Acceptance interpretation
(2 tracks)
X to Y?
4.
or Y to X?
What is the abundance of reversion of the implication?
Formula anticipations
(2 tracks)
Hz
5.
The novice then extensions the objurgate of reversion of the implication to twice the primal objurgate.
On the voltage-span graph (look restraintegoing page) pull another voltage-span deflexion pomping the
alteration of voltage with span which would be observed when the implication is metamorphoseed at twice the
primal objurgate.
Make assuflushed your deflexion is precisely pulln.
(2 tracks)
A transformer coercion a transistor radio marchs down 240V AC to 9.0V AC, which in metamorphose is
converted by diodes to 9.0V DC. The minor implication of the transformer consists of 60 metamorphoses and
the radio pulls 400 mA of electric floating.
6.
Calculate the compute of metamorphoses on the superfluous implication of the transformer.
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
turns
7.
Calculate the floating in the superfluous implication of the transformer. Acceptance in mA.
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
mA
Questions 8-12 apply to the subjoined counsel.
A novice conservations a laboratory transformer to authority a smample heating implication. The transformer runs off
240V RMS mains electricity and has a minor voltage of 12V RMS. The heating atom is
using 6W of authority.
8.
Calculate the peak-to-peak voltage in the minor implication.
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
V
9.
Determine the treaassuflushed of the ratio: Metamorphoses in Minor Implication
Turns in Superfluous Implication
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
10. Calculate the floating in the (a) minor implication (in A)and the (b) superfluous implication (in mA) of the
transformer.
Conservation a coercionmula and anticipation in your acceptance
(3 tracks)
Floating SECONDARY =
A
Floating PRIMARY =
mA
11. Which interest of the transformer (superfluous or minor) should possess the thicker wires? Elucidate.
Acceptance interpretation required.
(2 tracks)
Superfluous or
secondary?
12. During the serviceable essential-quality the novice mistakenly switches to 240V DC. Would the heating
atom quiescent issue? Elucidate.
(2 tracks)
PART 4:Yenka Essential-quality
Week 4Yenka: Authority Transmission essential-quality
Purpose
In this essential-quality you conciliate parallel the voltage waste in brace circuits: single withextinguished a transformer (Circuit 1)
and single with a transformer (Circuit 2). In twain circuits the memorable generator represents a authority situation,
the 1k?resistor represents the opsituation of the transmission plainions and the 10? resistor represents the
inculpate at the consumer.
Circuit 1
Open, in the subjoined order: Yenka, Fantastic Model. From the Parts Library (on the left of fence)
click on Electronics, Analog. Click on Memorable Generators and bring the generator on to the
euphuism window. Click on the (green) memorable generator and in the Propertiespane at left qualify the
abundance to 50Hz and the peak voltage to 45V.In the Parts Libraryclick on Passive Components,
and bring brace Resistors on to the euphuism window.Click on each resistor in metamorphose and in the
Properties pane qualify single to 1K? and the other to 10?. To move resistor click on the ?circle?
aggravate the resistor and move. To wire components concomitantly, click and pull betwixt them with your
mouse. From the Authority Supplies folder bring the Ground (Earth) to the standing pompn in Circuit 1
below.
From the Parts Library, click Presentation (scroll down) and bring the Graph icon onto the
euphuism window.Click and bring on the Target dupepresent to the flushed send on the graph window so that
a plainion connects the target dupe (a crosshair conciliate repartee present to the cursor)to a subject-matter betwixt the memorable
generator and the 1K? resistor. The connecting plainion goes stable when the affinity has been made,
and when the moconservation trifle is released it metamorphoses a flushed-dashed colour. In the Tracks folder in the
Properties pane experience Track 2 in the droop-down menu. Check the Pomp track pummel. Go end to your
graph and bring on the fantastic (blue) Target dupe so that a plainion connects the dupe (crosshair) to the circuit
betwixt the 1k? and the 10? resistor. Click on Property?to the left of the y-axis on the graph and
click on Voltage from the droop down menu coercion twain tracks. The Properties pane should repartee on left
of fence. Click on th Y-axis tab and regulate the Concatenate from -50V (Min) to ? (Max)with greater
gridlines sum 5V. Set the X-axis concatenate from 0 to 200 ms (milliseconds), with greater gridlines sum
50ms. Remember to conservation the Acceptance Questions 1 and 2 anteriorly pulling Circuit 2.
Circuit 2
Click on Memorable Generators and bring another generator on to the euphuism window. Click on the
(green) memorable generator and in the Properties pane at left qualify the abundance to 50Hz and the peak
voltage to 45V.In the PartsLibrary click on Passive Components and bring brace transformers on to
the euphuism window. Click on each transformer in metamorphose and in the Properties pane qualify single (left)
ratio to 0.4: 1 and the other (right) to 20:1. Bring brace resistors,with the selfselfsimilar treasures as you did with
Circuit 1, on to the euphuism window, and wire the components concomitantly. Add threeGroundsto the
circuit as pompn in Circuit 2 under.
Placing the cursor aggravate the flushed target dupe (crosshair), bring the dupe to a subject-matter on Circuit 2 to the left of
the 1k? resistor in the Transmission Circuit. Repeat coercion the cerulean-colored-coloblushing target dupe (crosshair), and bring the
dupe to a subject-matter to the just of the 1k? resistor in the Transmission Circuit. Now go end to the Tracks
folder in the Properties pane. Experience Track 3 in the droop-down menu (green). Check the Pomp track
box. Go end to your graph and bring on the fantastic (green) Target dupe so that a plainion connects the dupe
(crosshair) to a subject-matter to the left of the 10? resistor in the Inculpate Circuit.
Regulate the Y-axis flake on the graph to ± 120V with greater gridlines sum 5V so that you?ll look ample
three tracks. Look diagram under. Now acceptance Questions 3 and 4 on the present page.
Remember: Click on the Begin euphuism trifle in the dupesuppress to begin the euphuism. You may need
to click on the Rebegin trifle (just of graph window) pristine to reset. Also, conservation the Paconservation euphuism
trifle again to detain your tracks on your graph.
Apply end to the Sliding Pummel essential-quality in Unit 3 Week 3 to familiarise yourself with Yenka.
Week 4Yenka essential-quality: Authority TransmissionThis is a necessitated essential-quality
Circuit 1
Question 1.Portraiture (or portraiture and paste) your graph pomping the brace voltage-span tracks: a flushed track and
a cerulean-colored-coloblushing track. Palpably pomp which is which by using flushed and cerulean-colored-coloblushing ink, and palpably write and compute
your axes.
Question 2. Conservation your graph to experience (a) the voltage droop aggravate the transmission plainions (1K?resistor)
and (b) the voltage left coercion the consumer (10?load). Elucidate your acceptances.
Circuit 2
Question 3.Portraiture your graph pomping the three voltage-span tracks: a flushed, a cerulean-colored-coloblushing and a unseasoned track.
Palpably pomp which is which by using flushed, cerulean-colored-coloblushing and unseasoned, and palpably write and compute your axes.
Question 4. Conservation your graph to experience (a) the voltage droop aggravate the transmission plainions (1K? resistor)
and (b) the voltage left coercion the consumer (10? inculpate). Elucidate your acceptances.
PART 5
A heterogeneous god situation in the Northern Territory conservations a generator to procure its electricity.
The generator fruits 10.0A of floating at 300V.
Initially the electricity was carried plain to the farmhoconservation through crave regulators with a
sum opsituation of 20?.
The possessor of the god situation notices that the lights and appliances in the farmhoconservation are not
operating to their ample compatability and so conservations a voltmeter to meaassuflushed the voltage nature delivered
to the farmhouse.
1.
What percentage of the authority nature fruitd by the generator is past in the transmission
lines using the preparation aggravate?
Conservation coercionmulas and anticipations in your acceptance
(3 tracks)
%
2.
The possessor decides to suborn a span of transformers to march the voltage up to 3000V coercion
transmission, and then down to 200V coercion conservation in the lineage. Appropriate that the transformers
are 100% efficient.
Calculate the quantity of authority past in the transmission plainions using the preparation
shown aggravate.
Conservation coercionmulas and anticipations in your acceptance
(3 tracks)
W
A heterogeneous lighthoconservation issues on authority gifted by a diesel generator located 500m
away. The authority from the generator (1200W, 60V) is carried to the lighthoconservation through a
span of wires having a sum opsituation of 2.0?.
3.
Calculate the bigness of the floating that glides in the wires superfluous to the lighthouse.
Conservation a coercionmula and anticipation in your acceptance
(2
marks)
A
4.
Calculate the quantity of authority past in the wires.
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
W
5 . Calculate the voltage that is actually deliveflushed to the lighthouse.
Conservation a coercionmula and anticipation in your acceptance
marks)
(2
V
A authority situation fruits 200 MW of authority. It is stock that 20MW of this authority is past in
the transmission plainions anteriorly reaching a obscure town. The voltage input to the transmission
system at the authority stock is 500 kV.
6. What is the floating in the transmission plainions?
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
A
7.
What is the sum opsituation of the transmission plainions?
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
?
8.
What is the voltage deliveflushed to the town?
Conservation a coercionmula and anticipation in your acceptance
(2 tracks)
V
9.
At peak periods the authority conservation in the town extensions significantly. However, the authority
stock continues to fruit 500kV. Which of the subjoined is the most mitigated issue on
the voltage nature deliveflushed to the town?
A.
B.
C.
D.
The voltage would extension subordinately.
The voltage would curtail subordinately.
The voltage would halt the selfsame.
The voltage would halve.
(If you don?t perceive the acceptance delight don?t guess!! Feel bounteous to do so in the exam
though!!)
(2 tracks)
10. Why is the authority tranmitted at such exalted voltages?
At smallest brace trifle subject-matter interpretations required. You must enclose coercionmulas
marks)
(2
11. The graph under pomps the mediocre insist coercion electricity in Melbourne aggravate a 15 hour
period on a feature day.
300
250
Authority (MW)
200
150
100
50
0
9.00
am
12.00
3.00
Span of day
6.00
9.00
12.00
pm
(hours)
Calculate the sum quantity of electrical enthusiasm consumed betwixt 12.00pm (mid-day)
and 12.00am (midnight) on this day. Give your acceptance in (a) Joules and (b) kWh.
Pomp ample anticipations
(3
marks)
(a)
J
(b)
kWh

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