Annual Examinations For Secondary Schools Physics Worksheet - 2012 Page 12
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12b.
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
)
60
nails
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.
________________________________________________________________________________
(2)
iii.
Describe the effect on the magnetic field when the iron core is removed from the
solenoid..
________________________________________________________________________________
(2)
c.
A transformer has 2400 turns on the primary and 120 turns on the secondary coil. The
voltage across the primary circuit is 240 V.
Output
240 V
Input
120 turns
2400 turns
i.
This transformer is a (step-up / step-down) transformer.
(1)
ii.
Calculate the voltage in the secondary coil, given that the transformer is 100% efficient.
________________________________________________________________________________
________________________________________________________________________________
(2)
iii.
The current flowing in the secondary circuit is 1.2 A. Calculate the power in the
secondary coil.
________________________________________________________________________________
(2)
iv.
Give one reason why in practice a transformer is never 100% efficient.
_____________________________________________________________________________ (2)
Physics – Secondary Schools - Track 2 – Form 5 – 2012
Page 12 of 12
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