Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2012 Page 12
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12iii.
one physical quantity which must remain constant during this investigation,
________________________________________________________________________________
(2)
iv.
two precautions that they need to take during this investigation.
________________________________________________________________________________
________________________________________________________________________________
(2)
b.
They use the results recorded in the table to obtain the best straight-line graph shown below:
Graph of number of nails attracted (n
) against number of turns of solenoid (n
)
nails
turns
120
100
80
number of nails
attracted (n
)
nails
60
40
20
0
0
500
1000
1500
2000
2500
3000
number of turns of iron-core solenoid (n
)
turns
i.
Describe the relationship between the number of turns of wire of an iron-core solenoid
and the strength of the magnetic field set up around the solenoid.
________________________________________________________________________________
________________________________________________________________________________
(2)
ii.
Use the above graph to predict the number of nails that will be attracted by an iron-core
solenoid of 3000 turns using the same circuit as the other five iron-core solenoids.
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(2)
iii.
Describe the effect on the magnetic field when the iron core is removed from the
solenoid.
________________________________________________________________________________
(2)
iv.
Name one other physical quantity affecting the strength of the magnetic field.
________________________________________________________________________________
________________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 - Form 5 – 2012
Page 12 of 12
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