MAGNETISM
Questions from various worksheets collected over the years:
2. Sally was given rods A, B, C and D. The four rods were made of different materials.
3. May sets up an experiment to create an electromagnet as shown in the diagram below.
4. Lee placed some steel paper clips near a horseshoe magnet at three different positions X, Y and Z of the magnet. The results are shown in the bar graph below.
(a) Based on the diagram above, label position X,Y and
Z on the horseshoe magnet in the diagram below.
5. Priya secured four bar magnets onto a table and made a track using two glass rods. Priya placed the track in the center of the four bar magnets and also placed a rod magnet on the track as shown below.
(a) Label the poles of the bar magnets in the boxes (i) and (ii) provided above.
Questions from various worksheets collected over the years:
1.
Sam prepared the set-up below.
(a) What can be observed when Sam put some nails at
the bottom of the iron rod? Explain
(c) State two ways in which you can increase the strength of
an electromagnet.
_____________________________________________________________________________
2. Sally was given rods A, B, C and D. The four rods were made of different materials.
She
was told to find out which rod(s) is/are magnet(s). She held a magnet near the
ends of each rod, first at Y and then at Z. The following table shows the
observations she made.
Observations
|
Observations
|
|
Rod Bar
|
Y
|
Z
|
A
|
Attracted by the magnet
|
Repelled by the magnet
|
B
|
Repelled by the magnet
|
Attracted by the magnet
|
C
|
Attracted by the magnet
|
Attracted by the magnet
|
D
|
Was not attracted or repelled by
the magnet
|
Was not attracted or repelled by
the magnet
|
(a) Which rods are definitely magnets? Explain.
_____________________________________________________________________________
_____________________________________________________________________________
(b) Give an example of a material that Rod C could be
made of and explain your choice.
____________________________________________________________________________
3. May sets up an experiment to create an electromagnet as shown in the diagram below.
(a)
With a working battery and an iron nail as shown above, what should May do in
order to create an electromagnet?
________________________________________________
(b) State two ways to increase the magnetic strength
of the electromagnet.
______________________________________________________________________
(c) State one use of electromagnets. _________________________________________________
4. Lee placed some steel paper clips near a horseshoe magnet at three different positions X, Y and Z of the magnet. The results are shown in the bar graph below.
(b) Based on the results obtained as shown in the graph above,
what does this experiment tell you about the pull of the magnet?
(c) State one way to demagnetize the horseshoe magnet.
5. Priya secured four bar magnets onto a table and made a track using two glass rods. Priya placed the track in the center of the four bar magnets and also placed a rod magnet on the track as shown below.
Then
she observed that the ring magnet moved back and forth for a while at the
beginning of the experiment before finally coming to a stop in the middle of
the track.
(a) Label the poles of the bar magnets in the boxes (i) and (ii) provided above.
(b) What is the property of the magnets that caused
the rod magnet to move back and forth at the beginning of the experiment?
____________________________________________________________________________________________
6.
Ashy wanted to magnetize a steel bar. She used two magnets to stroke the steel
bar as shown in diagram 1 below.
(a)
State the poles of the magnetized steel bar at A and B
(b) State two ways in which Jolene is able to
demagnetize the magnet she has created?
__________________________________________________________________________
7.
Bar S and bar T are hung from a wooden bar as shown below.
A
magnet is then hung at equal distance between the two bars. the diagram below
shows how bar S and bar T react to the magnet.From the result shown above,
which bar, S or T, is definitely a magnet? Explain your answer.
8. The
diagram below shows a floating globe which uses the properties of magnet.
9. Jane and June set up an experiment
as shown below. They wanted to investigate how the material of the rod affects
the number of paper clips attracted. Four similar rods A, B, C and D, each made
of a different material, are used.
(a) The girls' teacher told them that they did not conduct a fair test. Why is this so?
__________________________________________________________________________
(b) Name two other variables that should be kept the same for the test to be fair?
__________________________________________________________________________
10. Mary set up an experiment as shown below:
The glass sheet was then replaced with an iron sheet.(b) Will the magnet still be able to pick up the iron nails? Explain why.
If
point X of globe is the N-pole of the magnet inside the globe, what is the
magnetic pole of points W, Y and Z.
Points on the floating globe
|
Poles
|
W
|
|
Y
|
|
Z
|
The
two girls lowered the rods, one at a time, into a box of paper clips and
recorded the number of paper clips attracted. The table below shows the result
of the experiment.
Rod
|
Number of turns of wire on the rod
|
Number of paper clips attracted
|
A
|
9
|
6
|
B
|
15
|
10
|
C
|
9
|
6
|
D
|
9
|
0
|
(a) The girls' teacher told them that they did not conduct a fair test. Why is this so?
(b) Name two other variables that should be kept the same for the test to be fair?
__________________________________________________________________________
(c) The girls observed that rod D did not attract any paper
clips. Suggest a reason why.
10. Mary set up an experiment as shown below:
(a)
The magnet was able to pick up nails even though there was a glass sheet in
between the magnets. Explain why.
The glass sheet was then replaced with an iron sheet.(b) Will the magnet still be able to pick up the iron nails? Explain why.
_________________________________________________________________________
Mary finally decided to use the horse-shoe magnet to attract some aluminum screws without placing any sheet in between
Mary finally decided to use the horse-shoe magnet to attract some aluminum screws without placing any sheet in between
(c) Will the magnet be able to attract the aluminum screws?
Explain why.
11. Navin
sets up an experiment on electromagnets as shown below.
__________________________________________________________________________
13. Sam was given the following materials. - one wooden ruler - one paper clip - 2 bar magnets T and U
Two magnets were used to stroke
another steel bar as shown in Diagram 3 below. Identify the poles of the
magnetized steel bar at X and Y respectively.
17. Sally placed pins, one at a time, at part A, B and C of a bar magnet until no more pins could be attracted by it. She observed the following result shown in Figure 1.
When Simon went home, he noticed that his mother left a piece of paper note on the door of the refrigerator. The note was held fast onto the door with the help of a magnet as shown below.
He
recorded his results as shown in the table.
Set-up
|
Number of batteries
|
Number of coils of wire
|
Number of paper clips attracted
|
A
|
1
|
20
|
2
|
B
|
2
|
20
|
5
|
C
|
3
|
20
|
7
|
(a) State the aim of his experiment.
__________________________________________________________________________
(b) Without changing the battery in Set-up A,
suggest another way to increase the number of paper clips to be attracted to
the electromagnet?
__________________________________________________________________________
(c) What is the relationship between the number of
batteries and the strength of the electromagnet?
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
12.Maggi placed three blocks of different materials on a
thin piece of cardboard, She then put a bar magnet under the cardboard and
moved the bar magnet to the other end of the cardboard as shown below.
Maggi
noticed that only the steel block moved with the magnet to the other end of the
cardboard
(a) Explain why the plastic and wooden block did not
move.
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
(b) The experiment was not a fair test. State what
Maggi should do to ensure a fair test.
__________________________________________________________________________
__________________________________________________________________________
13. Sam was given the following materials. - one wooden ruler - one paper clip - 2 bar magnets T and U
He was told to use all the above materials to find out
which magnet T or U has greater magnetic strength. Sam recorded his procedure
in the table below. Steps 1,2,4 and 5 had been written for you. Write down
steps 3 and 6 which he need to conduct to complete his experiment.
Steps
|
Actions
|
1
|
Place magnet T next to the ruler.
|
2
|
Place a paper clip along the ruler
about 20cm away from the magnet.
|
3
|
(a) ______________
|
4
|
Measure maximum distance between
magnet and clip that still allows clips to be attracted.
|
5
|
Repeat steps 1-4 for magnet T to
get reliable results.
|
6
|
(b) ____________
|
14. Ben
put three ring magnets through a vertical wooden rod, one above the other. He
observed that magnet 2 rested on top of magnet 1 while magnet 3 'floated' above
magnet 2.
(a)
Explain this observation.
(b) What could Ben do such that the three magnets were
attracted to one another?
__________________________________________________________________________
__________________________________________________________________________
15. Susan placed a magnet near an iron
rod. The iron rod moved towards the magnet.
(a)
Magnet exerts a _______________ on the iron rod.
(b) Choose the correct word from the box to answer the
question below. hard, magnetic,
strong
Susan's observation shows that iron is a
_______________ material
16. A steel bar was magnetised using the
'stroke' method as shown in Diagram 1 below.
Diagram 2 shows the magnetic poles of the steel bar after it was magnetised.
Diagram 2 shows the magnetic poles of the steel bar after it was magnetised.
17. Sally placed pins, one at a time, at part A, B and C of a bar magnet until no more pins could be attracted by it. She observed the following result shown in Figure 1.
What
can Sally conclude about the magnetic strength of the bar magnet based on the
diagram.
18. Joanne was given two similar
metal rods J and K. One of the rods was a magnet and the other was a magnetic object.
She wanted to find out which rod was the magnet. Joanne arranged the rods J and K
as shown in Figure 2. She found that there was a strong magnetic pull between
the rods. When she re-arranged the rods as shown in Figure 3, the magnetic pull
between them as weak.
Which
rod J or K is the magnet? Give a reason for your answer.
__________________________________________________________________________
__________________________________________________________________________
19. Simon conducted an experiment to
find out about magnetism in a science laboratory as shown below. The diagrams
below showed the results of the experiment that he has observed.
When Simon went home, he noticed that his mother left a piece of paper note on the door of the refrigerator. The note was held fast onto the door with the help of a magnet as shown below.
(a) Name a material that the door of the refrigerator is
most likely made of.
__________________________________________________________________________
__________________________________________________________________________
(b) Give a reason why the magnet was able to hold a piece of
paper on the door of the refrigerator.
__________________________________________________________________________
__________________________________________________________________________
20. Jessica
was given a large glass bowl containing a mixture of Styrofoam balls, iron
nails and pebbles as shown below. She was given a fish net, a magnet, a stirrer
and 500ml of water. She was then asked to separate all the three items in the
glass bowl. The four statements below describes what Jessica could do to
separate the items
Read the statements carefully and arrange them in the
correct order that Jessica should follow to separate the three items.
A - Pour away the water leaving behind only the pebbles.
B - Scoop up the floating Styrofoam balls with the fish net.
C - Pour water into the mixture and stir the mixture with the stirrer.
D - Remove all the iron nails by using a magnet to attract them.
B - Scoop up the floating Styrofoam balls with the fish net.
C - Pour water into the mixture and stir the mixture with the stirrer.
D - Remove all the iron nails by using a magnet to attract them.
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