Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 6
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12Section B.
This section has 5 questions. Each question carries 20 marks (100 marks).
+
-
8. This question is about the motor effect of an electric current.
•
•
The figure represents a circuit connected to a metal swing JKLM.
loops
This metal swing can move freely.
a.
On the wire KL, draw an arrow to indicate the direction of
J
M
current in the circuit when the switch is closed.
(1)
S
b.
Draw one line of magnetic flux between the poles of the
magnet.
(2)
K
L
State what happens around the wire in the circuit when the
c.
switch is closed.
N
___________________________________________________________________________
(2)
d.
When the switch is closed, the wire KL experiences a force.
i.
Underline the correct answer:
This force acts (out of the page towards you / inside the page, away from you)
(1)
ii.
Name the rule used to determine the direction of the force.
___________________________________________________________________________
(1)
iii.
State two ways through which the size of this force can be increased.
___________________________________________________________________________
(2)
iv.
What will happen if the wire KL is placed parallel to the magnetic field of the magnet?
___________________________________________________________________________
(1)
e.
Joe varies the current in the circuit and notes the size of the force as shown in the table below.
Force F / N
0
0.5
1.0
1.5
2.0
Current I / A
0
0.2
0.4
0.6
0.8
i.
Plot a graph of the force F (y-axis) against the current I (x-axis).
(5)
ii.
What is the relationship between the force and the current?
___________________________________________________________________________
(1)
iii.
Calculate the gradient of the graph.
___________________________________________________________________________
(2)
iv.
Determine the size of the current required to push the wire with a force of 3 N.
___________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 - Form 5 – 2013
Page 6 of 12
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